Billy Bob Thornton tells TMZ ... he'd be "more than happy" to attend Angelina Jolie's wedding (whenever she and Brad Pitt decide to tie the knot) ... if he's actually invited.
Several reports have surfaced that Angie already made the decision to invite her ex-husband to the eventual Jolie-Pitt wedding-palooza. But when we spoke to Billy at the Sunset Marquis last night, it was clear he hasn't received an official invite ... yet.
Pap: "I hear that Brad and Angie invited you to their wedding ... are you gonna go, do you think?
BBT: "I don't go out of town much ... but yeah, you never know, I'd be happy to ... I'd be more than happy to, absolutely."
So what would BBT get for the couple that has it all? Check out the footage and see what Billy thinks would be the "easiest" wedding gift he could give to his ex.