Jason Derulo poses naked

1 March 2011, 08:29 | Updated: 1 March 2011, 08:32

Jason Derulo's been stripping off...all in the name of charity.

The Ridin' Solo star tweeted, "I did a completely nude photo-shoot 2day with cosmo magazine to promote testicular cancer awareness! That's coming in June Ladies ;)"

Jason is currently on a UK tour which saw him play in Cardiff last night and he tweeted at the end of the gig "I wanna thank Cardiff for being so insane tonight (all 6,000 of you)! I had the craziest time! Tour coming to an end tomorrow in London! I can't believe it's almost over, but I'm also excited to finish up my album!!!!!!!!"