Mariah Carey flew in from the US to perform at the star-studded reception in London.
Afte rumours were circulating about the split, Adele has taken to Twitter to squash the story.
Adele has responded to rumours that she has broken up with her long term partner Simon Konecki. taking to Twitter, the Hometown Glory singer said "Simon And I are still very much together. Don't believe what you read."
See Adele's tweet below.
Just wanted to wish everyone happy holidays & all the best for 2015! PS Simon & I are still very much together, don't believe what you readx— Adele (@OfficialAdele) December 28, 2014
Adele's new album is expected early 2015. It'll be her first release since 2011's 21.
Watch the video for Someone Like You below.