Sean Kingston performs a private show at Bootsy Bellows in honor of his latest album; Jessica Szohr and Michael Sheen are among the many fans at Alt-J's concert at The Hollywood Palladium; Emmy Rossum, Lizzy Caplan, Jamie Chung, and others celebrate Ali Larter’s new cookbook, Kitchen Revelry, with Perrier-Jouet at Sunset Tower—take a peek at Tuesday's top L.A. happenings in this edition of Last Night's Parties.