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Why Did Katy Perry Miss Rihanna's Birthday Bash?

Rihanna's birthday party was full of famous faces, but one was MIA: her bestie, Katy Perry.
/ Source: E!online

Rihanna's birthday party was full of famous faces, but one was MIA: her bestie, Katy Perry.

A slew of stars such as Zac Efron, Ryan Phillippe, Jay-Z, Diddy and Snoop Dogg hit the private L.A. bash Sunday night, but Katy was too busy elsewhere.

Was she trying to get back at Rihanna for missing her wedding ?

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Hardly!

Katy was busy kicking off her California Dreams tour in Portugal, but still sent RiRi some birthday love across the Twitterverse.

"happy birthday boo. Wish I could b there to blackout! Luv U!" Katy tweeted Sunday as Rihanna was partying after she performed at the All Star Game.

The birthday girl totally understood, replying back "bitch are u kidding? I missed ur WEDDING!! This is small stuff boo! #whenworkcalls".

Good to see all is well between two of our favorite fierce females!

WATCH: Rihanna's pre-party performance