Celebrity Jennifer Aniston and Justin Theroux Celebrate Ben Stiller, Plus More Parties! By InStyle Editors InStyle Editors Facebook Instagram Twitter Our editors and writers comprise decades of expertise across the beauty, fashion, lifestyle and wellness spaces in print and digital. We prioritize journalistic integrity, factual accuracy, and also having fun with every story we share. InStyle's editorial guidelines Published on November 16, 2012 @ 02:31PM Pin Share Tweet Email Photo: Jeff Vespa/WireImage Jennifer Aniston and Justin Theroux were quite the coordinating couple in on-trend black-and-white ensembles at last night's 26th American Cinematheque Awards in Beverly Hills. The recently engaged stars were on hand to honor fellow actor Ben Stiller, who the lovebirds greeted just after walking the red carpet. Aniston gave Stiller a friendly hug—the two co-starred in 2004's Along Came Polly—before revealing to InStyle.com the designer of her dress as she passed by: "It's Valentino!" Plus, see who else partied last night! MORE: • Aniston’s 8 Beauty Must-Haves• Try On Jennifer’s Many Manes!• Jen’s Hair Transformation Here — Lindzi Scharf