Joey Buttafuoco -- I'm Happy Mary Jo Got Hitched

Joey Buttafuoco says he's happy his infamous ex-wife got re-married this weekend, but in news that should shock absolutely no one ... he describes his relationship with Mary Jo as "strained."

Our photog bumped into Joey and his current wife in Beverly Hills yesterday, where he said he's actually met Mary Jo's new hubby and described him as "a really nice guy."

But when it comes to him and Mary Jo these days, Joey told us, "Mary Jo and I, we still speak. It's strained, but you have to understand why … unless you've been under a rock."