Ben Affleck and Jennifer Garner were spotted laughing ... looked casual in blue jeans and a green button-down shirt layered under a coordinating jacket. He accessorized with brown lace-up boots.

The Argo director, 52, wore a cream cardigan over a white shirt and ... to the back. Ben talked about why he and Matt are such a good team on the red carpet. Damon and Affleck co-produced the ...