It really happened. Donald Trump has been sworn in as 45th president of the United States while the world watched - and, of course, commented.

Many well-known Brits - who overwhelmingly spoke out in favour of Democratic nominee Hillary Clinton during the election campaign - have taken to social media as they looked on at the inauguration day events across the pond.

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Here are a few of the best Twitter reactions from British stars, starting with Piers Morgan, who led the support for the new president...

Which annoyed Gary Lineker...

Who later said this...

James Corden continued to roast Trump for how he penned his speech...

And J.K. Rowling, a prominent Trump critic, compared the inauguration of the new president to an "alternative reality".

While comedian Dom Joly drew comparisons with a Hollywood movie...

Writer Caitlin Moran commented on Trump's tanned complexion...

Historian Tom Holland reminded us how Brits do this kind of stuff differently...

And BBC Breakfast presenter Dan Walker couldn't help but notice the choir during the inauguration ceremony...

As always, comedian Frankie Boyle looked on the bright side...

Richard Osman highlighted the clash in TV programming...

While 'Elizabeth Windsor' had this message for Americans...

From: Digital Spy