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Jennifer Aniston looked primped to perfection on the red carpet for her newest flick Wanderlust co-starring her real life love, Justin Theroux ... who looked dashing at the LA event.

The former Friends star rocked a strapless black and gray Tom Ford dress. Theroux opted for a classic black suit.

In Wanderlust, Jen and Paul Rudd play a NYC couple who leave the Big Apple due to the recession and land in a Georgia commune ... where hippies are everywhere. Yep, Theroux plays a guy who is all about free love and marijuana. Whew ... he cleans up well.

We also had to ask when he plans to marry Ms. Aniston. Check out his response below!