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The 46-year-old singer mimics Boris Johnson's press conference speeches in the video, which addresses this year's pandemic.
It begins with Robbie - decked out in a festive jumper - singing: "Oh what a miserable year/But what a time to be alive... So I wonder who's gonna decide/If we can do the Auld Lang Syne."
You can watch it below:
After a couple of verses, the video switches to Robbie, dressed up as Boris Johnson behind the lectern, along with two others impersonating Sir Patrick Vallance and Professor Chris Witty.
The singer then takes aim at some of the ambiguous messages from the government, such as 'stay home', 'eat out' and 'stay alert'.
The song continues: "So what are we to do/About your FaceTime's and your Zooms?/There's a room inside my mind/And it's always here for you/Nothing's gonna stop Christmas.
"No chance/You can't take away our season/Like you can take away the why's (Santa's on his sleigh, but now he's two meters away)/The people gonna need something to believe in/After a year of being in."
Instead of Boris answering questions from journalists and members of the public, Robbie instead can be seen on the big screen.
And later in the video, Boris (aka Robbie) steps out from behind the lectern and begins dancing with Sir Patrick, Chris and none other than Theresa May (or at least someone impersonating the former PM) - who starts twerking and doing the splits at one point.
Robbie is certainly inspiring some Christmas cheer with the song, with him going on to sing: "You can't take away our season/Like you can take away the why's (I spoke to Santa Claus, I hear he's waiting at the door).
"The people gonna need something to believe in/After a year of being in/We've all missed this/So here's our wish list/You can't stop Christmas time."
And people are loving the video, with one writing: "Robbie Williams as Boris Johnson is a feast for the eyes" while another tweeted: "Robbie as Boris Johnson has made my year."
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