Pop Singer Katy Perry celebrated her 25th birthday with Taylor Swift, Perez Hilton and many others by throwing a herself a “Willy Wonka and the Chocolate Factory”-themed birthday bash! Other stars that attended included singer Jojo, Julianne Hough of “Dancing With the Stars” Perry’s boyfriend, Russell Brand (Host of the 2009 & 2008 MTV Awards. Guests were all required to wear white. And when they left the party, they were seen splattered in multicolored paint!