rihanna katy Katy Perry celebrates Rihanna's birthday: Hear her covers of Rihanna, Jay Z, Willow SmithRihanna celebrated her 23rd birthday on Sunday with an explosive half-time performance at the NBA All-Star Game in Los Angeles, but her BFF Katy Perry was across the world on her California Dreams Tour in Portugal.

Distance didn’t stop Perry from celebrating her bestie, though. At Sunday’s show she performed an acoustic version of Rihanna’s “Only Girl (In The World)” and giving Rihanna a birthday shout-out. She segued easily into Jay-Z’s classic “Big Pimpin’,” for which she broke out her sparkly recorder. Yes, recorder. Next up came a cover of Willow Smith’s “Whip My Hair,” with surprisingly zero hair-whipping.

Perry also left Rihanna a Twitter message: “Happy birthday boo. Wish I could b there to blackout! Luv U!” she wrote.

What do you think of her covers of some of our fave songs, Zappers?

Posted by:Carina MacKenzie