The moment, which was caught on camera, has taken off like wildfire across Twitter.
The pair won the Oscar for Best Original song, sharing the award with Mark Ronson who co-wrote the number.
The British star of The Favourite won Best Actress on Sunday night, ahead of Glenn Close for The Wife and Lady Gaga for A Star Is Born.
It was another controversial moment for the controversial winner.
History has been kind to these Oscar losers.