Katy Perry, Britney Spears, Neil Patrick Harris, and others attend the premiere of Smurfs 2; Anna Kendrick, Paula Abdul, and Priscilla Presley show support for Dizzy Feet Foundation's Celebration Of Dance; Kiernan Shipka, Patrick Schwarzenegger, Abigail Breslin and Nina Dobrev make appearances at Variety's 7th Annual Power Of Youth event; Stacy Keibler, John Stamos, Paris Hilton, Scott Disick, and others support the Asphalt Yacht Club fall 2013 collection launch party; Christina Aguilera, Carson Daly, and Spencer Grammer attend Television Critics Association NBC Party; Jay-Z and D'USSE Cognac host the official Legends of the Summer after party—catch up on this weekend's top events with this edition of Last Night's Parties.