As we told you, the couple is welcoming their closest friends and family members to a celebration this weekend at Ben's estate he owns in the coastal town of Riceboro, Georgia. The property is close to 100 acres, with several homes on site, so there's plenty of space for festivities.
TMZ broke the story, the estate was supposed to serve as the location for Ben and Jen's wedding 20 years ago when they were first engaged ... so the party this weekend will serve as a full-circle moment.
It's currently unclear which of the couple's A-list friends will be there, you gotta imagine Matt Damon will attend, but it's sure to be quite the event.
Of course, Ben and Jen got hitched in a small ceremony at a chapel in Vegas back in July -- with only their kids in attendance -- so it's time to let loose and do it big this weekend.