Katy PerryJohn Shearer/Getty

“Can’t wait to see you @TheGroveLA at 3p today for a #MEOW-y Christmas!” Katy Perry (in Moschino) tweeted to awaiting fans as she made her way to The Grove in Los Angeles for the unveiling of her new Meow! by Katy Perry fragrance. Click through to see Rooney Mara, Rachel Zoe and more stars at last night’s hottest parties!