Justin Timberlake, Jessica Biel, Timbaland and Amy Adams attend Darren Le Gallo's art opening; Flo Rida and Kendra Wilkinson debate on who wore it better at OK! Magazine's pre-Grammy party; John Legend and Christina Milian hang with the Mayor at a music industry reception; L.A. Reid, Jeffery Katzenberg and Ciara party at Beacher's Madhouse with Epic Records; Gary Oldman, Harrison Ford and Billy Bob Thornton celebrate the opening of the Morrison Hotel Gallery by forming the ultimate boy band—okay, so they didn't form a boy band, but it's fun to pretend while getting the rundown on Thursday's top events in this installment of Last Night's Parties.