Pharrell Williams, Katy Perry, Rachel Zoe, Wolfgang Puck, and many others step out for MOCA's 35th Anniversary Gala Presented By Louis Vuitton; Lea Michele, Selena Gomez, Cody Simpson, Adam Sandler, and dozens of other stars join host Mark Wahlberg at Nickelodeon's 27th Annual Kids' Choice Awards; Emma Roberts, Kathy Bates, Evan Peters and fellow "American Horror Story" stars hit the PaleyFest closing night—get the details on the weekend's top L.A. events in this edition of Last Night's Parties.