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Katy Perry celebrated her 25th birthday party at restaurant The Beach On Sunset in West Hollywood last night with a Willy Wonka and the Chocolate Factory themed party, where she asked all her guests, including boyfriend Russell brand, Taylor Swift and Julianne Hough, to come to the bash wearing white.

P.Diddy, the king of white parties, was also a guest at Katy's, and ya'd think he'd have enough white already, but he sent his assistant out to pick him up six new pairs of Levi's before the big bash!

We hope her guests weren't wearing anything they really cared about, because Katy broke out the neon paint during the night to paint, roll and splatter them with the brights! Taylor and her country bff Julianne even wrote their initials on each other. Awww, how cute!

But the party didn't end there -- Katy and some of her guests went on to an after-party at H.Wood, where she was joined by none other than Ms. Lohan! Clubbing again, Lindz? Does your daddy know?

With Russell on her arm the entire night, we're sure things were plenty wild at the party, but probably got even wilder when the pair got home. Remember Russell's big birthday purchase at Coco de Mer? Yeah, we bet Katy's still recovering from that this morning!