Looks like Karrueche Tran had a fun birthday.
At least that's what we're inferring from this Instagram photo of her naked butt - with Chris Brown's smiling face resting comfortably on that piece:
Chrianna fans relax, though. At least in part.
The photo is actually a year old, exactly.
She captioned the risque "Throwback Thursday" image, "My birthday last year. Who's face am I gonna put my ass in this year? Lmao I'm kidding."
Are you though, Karrueche Tran?