The 54-year-old was sentenced at St Albans Crown Court for the assault during a party at a friend's home.
This breaking news story is being updated and more details will be published shortly.
Please refresh the page for the fullest version.
You can receive breaking news alerts on a smartphone or tablet via the Sky News app. You can also follow us on WhatsApp and subscribe to our YouTube channel to keep up with the latest news.
The prime minister told PMQs that the nonconsensual sex images produced by the platform's Grok AI tool are "disgusting" and "shameful" .
Politics Live: Elon Musk is complying with UK law in relation to Grok image abuse
He added that X's decision to turn its AI image editing tool into a premium service was "horrific" and ministers are "absolutely determined to take action".
Responding to a question from Labour MP Emily Darlington, Sir Keir said: "I have been informed this morning that X is acting to ensure full compliance with UK law.
"If so, that is welcome, but we're not going to back down, and they must act.
"We will take the necessary measures. We will strengthen existing laws and prepare for legislation if it needs to go further, and Ofcom will continue its independent investigation."
Read more: Everything you need to know about Grok controversy
After the prime minister's comments, Mr Musk wrote on X: "I not aware of any naked underage images generated by Grok. Literally zero.
"Obviously, Grok does not spontaneously generate images, it does so only according to user requests. When asked to generate images, it will refuse to produce anything illegal, as the operating principle for Grok is to obey the laws of any given country or state.
"There may be times when adversarial hacking of Grok prompts does something unexpected. If that happens, we fix the bug immediately."
In a second post, he wrote: "History will not be kind to Starmer."
He was sharing a post by Reform's head of policy Zia Yusuf that said the PM was "now coming after your end-to-end encrypted messaging apps like Whatsapp and iMessage".
Ofcom, the media regulator, launched an investigation into X on Monday following mounting concerns over reports Grok was allowing users to manipulate images of women and children to sexualise them.
Technology Secretary Liz Kendall said the watchdog would have ministers' full support to take action against X, including effectively banning the platform in the UK, if the company did not make changes.
She condemned the platform's decision to limit some use of Grok's image generating function to X's paying subscribers, saying the platform was "monetising abuse".
And Ms Kendall said legislation making it a criminal offence to create or request the creation of non-consensual intimate images would come into force this week following the Grok outcry.
Mr Musk, the site's billionaire owner, had initially claimed the threats were part of an effort to censor X.
Sir Keir also called it “astonishing” that Reform UK defended Mr Musk on the issue.
"I said the images are disgusting, their position is disgusting on this. This is weaponising images of women and children that should never be made."
Reform UK's leader Nigel Farage has called the images being produced by Grok "horrible in every way" but said that banning X would infringe on free speech.
Ofcom's powers fall under the Online Safety Act, which states that online platforms have to make sure they're not hosting illegal content.
If X is found to not comply with the Online Safety Act, Ofcom can issue a fine of up to 10% of its worldwide revenue or £18m, and if that is not enough, can go as far as getting a court approval to block the site.
Previous contests have been marred by allegations of fraud, and an internet shutdown on Tuesday was met with dismay from pro-democracy activists.
Analysts say Mr Museveni will almost certainly stay in power, despite facing a challenge from the musician-turned-politician best known as Bobi Wine, who represents those yearning for change.
At 81 years old, the president has become ever more reliant on Uganda's security forces to keep him in the position he has held since 1986.
His son, General Muhoozi Kainerugaba is the military's top commander and is viewed as the presumptive heir.
Mr Wine has accused the military of interfering in the electoral process.
Read more from Sky News:
Why Antarctica's underwater tsunamis are alarming scientists
Four people killed in Gaza after walls collapse
Why has the internet been shut down?
On Tuesday, less than 48 hours before the start of the voting, the Uganda Communications Commission directed internet service providers to temporarily suspend the general public's access to the internet, as well as the sale and registration of new SIM cards.
The agency said this was "necessary to mitigate the rapid spread of online misinformation, disinformation, electoral fraud, and related risks".
This was a blow to pro-democracy activists and people who would use the internet to share information about alleged election threats including ballot stuffing and other practices that are alleged to routinely plague Uganda's contests.
Mr Wine's party, the National Unity Platform, has urged followers to remain near polling stations and be watchful after voting as part of an effort to prevent rigging.
"We implore everyone to use their cameras and record anything irregular," he said on social media.
Electoral officials, however, are urging Ugandans to cast their ballots and then return home, perhaps coming back later to witness vote counting.
The argument about polling stations has raised fears of violence if security forces choose to enforce the guidance from the electoral body.
Who is Bobi Wine?
Before getting into politics, Mr Wine was a famous pop star in the East African country.
He won a seat in the national assembly in 2017 before running for the presidency in 2021 - losing to Mr Museveni in an election he claimed was rigged against him.
He is especially popular among young Ugandans in urban areas.
In 2024 he was shot in the leg after a confrontation with security agents, his party said.
Videos posted online showed Mr Wine surrounded by followers who shouted that he had been shot in the leg before some supported him into a waiting car.
Who is the six-time president Yoweri Museveni?
Mr Museveni is seeking his seventh term in office after coming to power in 1986 on a wave of optimism due to his earlier roles in insurgencies against autocratic governments, including those of Idi Amin and Milton Obote.
After seizing power, he said: "The problem of Africa in general and Uganda in particular is not the people but leaders who want to overstay in power."
In 2005, parliament scrapped presidential term limits, in a move critics said was designed to let Mr Museveni stay in power for life.
His tenure has been dogged by public anger over alleged corruption and Western claims of election irregularities, but he has been unrepentant, once saying: "If the international community has lost confidence in us, then that is a compliment because they are habitually wrong."
Valdo Calocane was under the care of the Nottinghamshire Healthcare NHS Foundation Trust in the years leading up to the June 2023 attack - which claimed the lives of Barnaby Webber, Grace O'Malley-Kumar, both 19, and Ian Coates, 65.
Now a fresh report from The Care Quality Commission (CQC) has revealed the trust's mental health services "were not always humane, dignified or gave high-quality care" when treating patients.
Calocane admitted manslaughter by diminished responsibility and attempted murder and was sentenced to an indefinite hospital order in January 2024.
Experts said his schizophrenia meant he was not fully responsible for his actions, and since his trial a long list of missed opportunities to prevent him committing his crimes has emerged.
He was under Nottinghamshire Healthcare NHS Foundation Trust's care between May 2020 and September 2022.
Between May 2024 and August 2025, the CQC carried out 39 inspections at the trust, before a trust-wide review of its leadership was carried out last September.
The resulting report said the trust was found to have breached regulations about how it was managed and, following the inspections, it had been asked to provide an action plan.
The CQC said: "Due to the level and nature of risks identified, we have taken enforcement action and asked the trust to make significant improvements and to work collaboratively with key stakeholders in the wider healthcare system to support significant improvement."
Seven of its 18 services were rated as requiring improvement, including five mental health services.
The families demanded that the trust be put under special measures until issues are addressed.
In a statement, the families of Mr Webber, Ms O'Malley-Kumar and Mr Coates said: "This report confirms what families have feared for far too long: this trust is not safe and should be placed into special measures immediately.
"Families have lost all confidence that this trust will learn on its own. If it is allowed to continue unchanged, there is a real fear that further harm and further disasters are inevitable.
"This is no longer about improvement plans or assurances. It is about urgent intervention, accountability at the highest level, and protecting lives."
Greg Almond, partner at Rothera Bray Solicitors, who represents attack survivors Wayne Birkett and Sharon Miller, said there were "significant and glaring problems" in Nottinghamshire's mental health care.
He said in a statement: "The report acknowledges the significant amount of scrutiny the trust was under following the attack. Despite this, the CQC conclude that there remain significant and glaring problems in the mental health provision in Nottinghamshire.
Read more from Sky News:
Russia waging hybrid war on the UK
New train line set between Birmingham and Manchester
"For the survivors, who deserve to have faith in the mental health provisions in Nottinghamshire, this is a deeply worrying assessment, and they can't help but be left with the feeling that nothing has been done to prevent a reoccurrence."
Ifti Majid, chief executive of Nottinghamshire Healthcare, said: "We accept the CQC's findings and recognise where improvement is needed.
"We have already made significant improvements since the CQC's last inspection, but fully appreciate there is still more to do. We will be addressing all areas identified in the report."
The events leading up to the killing of Mr Webber, Ms O'Malley-Kumar and Mr Coates will be looked at in a public inquiry starting in February.
Calocane also attempted to kill three other people in the attack.
In a post on Truth Social on Wednesday, the US president said the vast Arctic nation "is vital for the Golden Dome that we are building".
The Golden Dome project, to build a missile defence shield, was announced by Mr Trump in May.
"IF WE DON'T [take over Greenland], RUSSIA AND CHINA CHINA WILL, AND THAT IS NOT GOING TO HAPPEN!", he added, warning that NATO would be "far more formidable and effective" if Washington took over.
It came as Danish and Greenlandic foreign ministers arrived at the White House for a meeting with US vice president JD Vance and secretary of state Marco Rubio.
As the meeting was about to take place, Greenland's government announced that Danish armed forces would expand their presence and continue exercises on the world's largest island in close cooperation with NATO allies.
In a later post on the social media platform, Mr Trump said Denmark had been warned of China and Russia's "military goals" towards Greenland.
Greenland, home to about 57,000 people, has been a Danish territory for centuries and Mr Trump's desire for the US to acquire it has provoked concern in Copenhagen and its allies.
At a meeting of his cabinet on Wednesday, French President Emmanuel Macron said that if the sovereignty of an ally is affected, the "knock-on effects would be unprecedented".
Mr Trump's desired land-grab is not backed by the vast majority of Americans, according to an Reuters/Ipsos poll, which found just 17% of them support the idea.
Almost half (47%) of those polled disapproved of the plan, while 35% were unsure, the survey published on Wednesday, said.
Mr Trump's post did not mention using force, but the US president has not ruled out something that, according to Danish Prime Minister Mette Frederiksen, would mean "everything stops… including NATO".
Mr Trump has said the US will acquire the nation "the easy way or the hard way", an apparent reference to using its miltary power if necessary.
The poll found large majorities of Democrats and Republicans against annexing the island by force.
Only 4% of Americans - said it would be a "good idea", while nearly three-quarters (71%), including nine in 10 Democrats and 60% of Republicans, disagreed.
Read more:
Trump on Greenland - 'one way or another'
Where could US strike next?
Why Trump may not stop with Venezuela
Speaking to Sky's US partner network NBC News last week, Mr Trump said Greenland "is very important for the national security of the United States, Europe, and other parts of the free world".
Mr Trump, whose stated aim is to control the Western Hemisphere, has already shown his willingness to take action in support of his aims by removing the Venezuelan President, Nicolas Maduro, earlier this month.
He has said the US will "run" the country and its oil firms manage the South American nation's oil industry after ordering the military raid.
The Golden Dome system - styled on Israel's Iron Dome - is designed to be able to detect and stop missiles at all points of attack, from before launch to when they are descending towards a target, the Trump administration has said. The White House has said that Canada had agreed to take part.