Perry Sad About Missing Rihanna’s Birthday Party

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February 21, 2011 | 11:45am EST

Rihanna has no problem with close friend Katy Perry skipping her birthday bash – because she’s still not forgiven herself for missing her pal’s wedding to Russell Brand.
The Umbrella hitmaker turned 23 on Sunday and marked the occasion with a massive party.

In a post on her page, she writes, “Go grawl, its ya birthday, ITS PARTY TIME! All my best friends are here!!!! And my BRO!! Wish u cud see how SICK this s**t is!!! Stay tuned.”

Perry, who is currently on tour in Europe, replied: “Happy birthday boo. Wish I could b there to blackout! Luv U!”

But Rihanna told Perry she shouldn’t be sad about skipping the celebrations, insisting missing Perry’s October wedding to the British funnyman was a bigger snub.

The Bajan beauty adds, “B**ch are u kidding? I missed ur WEDDING!! This is small stuff boo! When work calls.”