Katy Perry Celebrates Her New Single with Red Velvet Cake

• Katy Perry threw a party to debut her new single "California Gurls" - and the singer made sure she had her favorite treat with her: red velvet cake. Also there? Her fiancé Russell Brand and close pals who all fêted the new tune - and a friend's birthday - at Trousdale Lounge in L.A. Nearby, real-life (and virtual) lovebirds Avril Lavigne and Brody Jenner, who hung out with the Hills's star's mom, Linda.

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