Ben Affleck‘s leaning on his friends in the middle of his divorce … giving a big hug and kiss to Matt Damon‘s wife Luciana Barroso.

The actor was spotted in Los Angeles arriving to a meeting and giving a little side hug and top-of-the-head smooch to his best bud’s longtime partner … a sweet moment between a pair of friends.

Luciana’s clearly happy to see BA … big grin on her face as she returns his side embrace on the sidewalk.

Affleck’s clearly looking to his friends for support during this difficult split … remember, he, Matt, Luciana and their kids grabbed dinner at the end of August together — apparently laughing the night away.

As we told you … Matt was recently photographed holding J Lo‘s hand during a discussion at the Toronto International Film Festival last week — looking pretty damn serious.

People Mag reports the chat went on for 20 whole minutes … so, it sounds like the pair touched on some deep topics at TIFF.

Matt and Luciana got close with J Lo during her marriage to Ben — regularly hanging out at public functions together — so their divorce puts a wrinkle in their closeness, ya gotta think.

As you know … J Lo filed for divorce sans lawyer last month — and, apparently the two don’t have a prenup, so expect divorce proceedings to take awhile.

J Lo’s looking fine after the filing … showing off her abs while walking around in a crop top in L.A. Friday.