Cher, Sameul L. Jackson, Demi Moore, Sidney Poitier and other Hollywood legends get together for the AFI Night at the Movies Presented by Target; Courteney Cox, Amanda Scheer-Demme and Gina Gershon celebrate Wear LACMA; Robert Downey Jr., Gwyneth Paltros, Chris Hemsworth and a bunch of other beautiful people light up the red carpet at the Iron Man 3 premiere; Alessandra Ambrosio and Kendall Jenner attend the opening reception for Russell James' exhibition at Guy Hepner; Ciara, Theophilus London and Vanessa Hudgens fete a new SKYY Vodka flavor; Heidi Klum, Howard Stern and their cohorts celebrate Season 8 of "America's Got Talent"—it was a busy Hump Day in L.A. but we are here to walk you through it all in this installment of Last Night's Parties.