Date night! It was couples night at Matt Damon's Pacific Palisades mansion Saturday night, as he invited Ben Affleck and Lindsay Shookus over to watch the big fight. No private jets to Vegas, not after-parties with Mayweather, no weekend of gambling ... Ben kept relatively quiet with his new lady love, not crossing state lines, but just crossing the street, to hang with his longtime BFF for the Floyd Mayweather / Conor McGregor match.

And what a match it was, right? Not fixed; not predictable; not just a money-making scheme ... it was the real deal, right? Sheesh ... for a miraculous ten rounds these two put on a decent show, fooling no one and raking in the dough ... eh, more power to 'em!

So back to Ben ... he and Lindsay left Matt's house arm-in-arm just before midnight and headed back to Ben's Brentwood bachelor pad. The pair was dressed alike in black tees and jeans and we have a feeling Ben was smiling because he certainly didn't lose any money on his bets last night!