Justin Timberlake pulled double duty last night -- appearing at a party with his "Social Network" castmates before jetting to another bash for girlfriend Jessica Biel.
Justin was on hand as Jessica, Eva Mendes and Rachel Weisz made their directorial debuts with a series of short films at last night's Glamour Reel Moments Presented by Hyundai event in Hollywood.
Before the Glamour event, JT also hit the stage at the 14th Annual Hollywood Awards Gala presented by Starz at The Beverly Hilton.
Check out who else popped up at the Glamour bash!
