Jason Derulo: Capital FM Jingle Bell Ball 2013

Jason Derulo poses backstage on day two of the 2013 Capital FM Jingle Bell Ball held at the O2 Arena on Sunday night (December 8) in London, England.

The 24-year-old singer was joined by a ton of other artists, including Lady Gaga.

PHOTOS: Check out the latest pics of Jason Derulo

“Quick chill after the gym,” he later captioned an Instagram pic of him lounging around shirtless by the pool. Check out the photo below!

Two nights earlier, Jason cozied up to his girlfriend Jordin Sparks after his performance at 102.7 KIIS FM’s 2013 Jingle Ball concert held at the Staples Center in Los Angeles.

10+ pics inside of Jason Derulo performing in London…