Justin Theroux Jennifer Aniston The Chateau Marmont leather hat

Justin Theroux enjoyed an afternoon at The Chateau Marmont with two ladies ... none of which were Jennifer Aniston. Must of been an important business meeting!

The Wanderlust star, decked in all-black leather, has been working hard to promote his latest flick ... but all of his promotional airtime didn't help the movie's debut weekend. The movie flopped at the box office with $6.6 million opening weekend.

The silver lining is that Theroux met his sexy ladylove on the set. Sounds worth it to us!