Jennifer Aniston and Justin Theroux posed for photos side by side last night at the Beverly Hilton Hotel, where they attended the 26th Annual American Cinematheque Awards. The big honoree of the evening was Ben Stiller, a close friend of both Jen and Justin. Jen worked with Ben on Along Came Polly and Justin's best-known collaboration with Ben is Tropic Thunder. Ben and his wife, Christine Taylor, spent plenty of time with Jen and Justin. The two couples were in Hawaii last Summer for a joint vacation in honor of Christine's 40th birthday. Yesterday, Jen wore a black and white Valentino gown, coordinating with Justin's tux nicely, to congratulate both Ben and Christine on Ben's long career.