Rihanna celebrated her 23rd Birthday at a Beverley hills party, inviting a whole host of A-list pals - including Beyonce, Jay-Z, P Diddy and even Zac Efron. Take a look inside...
Wondering where her Bestfriend Katy Perry is? Katy couldn't make it, she tweeted RiRi saying,
"happy birthday boo. Wish I could b there to blackout! Luv U!"
Rihanna hit her back with,
"bitch are u kidding? I missed ur WEDDING!! This is small stuff boo! #whenworkcalls".