Katy Perry celebrated her 25th birthday this weekend with her boyfriend Russell Brand and friends in a party in West Hollywood.

According to sources at the party, the birthday girl seemed to be hitting it off with her new lover. “While the crowd was singing, ‘Happy Birthday,’ Russell had his arm around Katie’s dad’s shoulder,” a partygoer revealed. Another source even heard Perry gushing to a pal about her new beau, saying, “Do you want to meet my boyfriend? He’s hilarious!”

Of course, a Hollywood party won’t be complete without the celebrities like Taylor Swift. The invitation asked Perry’s family and friends to wear all-white to her Willy Wonka-themed bash, but warned “But you might not leave all white.”

Katy herself started the food fight with her birthday cake. Someone who attended the event said, “There was cake all over the floor, and the crowd started dancing on top of it to ‘Like a Virgin.’” Aside from the food fight, the partygoers also had paint-splattering.

The party then continued at the hit nightclub H.Wood, where Lindsay Lohan stopped by but left quickly. A source said, “Lindsay walked into the bathroom with a few girlfriends, complaining that some guy scratched her cornea. Lindsay’s friends kept telling her to find some contact solution and flush out her eye. She left really quickly.”

Images from Wenn.com