Sophia Bush, Gillian Zinser and a slew of others join Blake Mycoskie for the opening of the TOMS flagship on Abbot Kinney in Venice; Demi Lovato, Britney Spears, Simon Cowell and other "X Factor" personalities hit the season finale press conference; Logan Lerman, Ariane Bellamar and more step out for the annual Working Dreams And Families For Children holiday party—get the rundown on Monday's top events in L.A. in this edition of Last Night's Parties.