At long last, The Happening star Mark Wahlberg has an event coming up that no one thought would ever happen: a wedding!

OK! was the first to reveal that the actor,37, planned to wed his longtime girlfriend and mother to their two children model Rhea Durham,29.  Now OK! is also the first to break the news that the couple plans to wed in December!

"Mark has trust issues, and that’s why he’s been reluctant to marry," a friend of the actor tells OK!.  "But he’s gotten past that and he’s ready to show Rhea how proud he is to be with her and their kids."

There may be another reason as well.  Mark and Rhea, who already have two children Ella,4, and Michael,2, are expecting their third child in September.

Indeed, at his film’s June 11 premiere, Mark told OK! how much he loves being a dad.

"God, all the joy I get, even the kids are beating me up!" he said, adding, "I made a lot of mistakes when I was younger. I’m going to try and guide them in the right direction and provide a better life for them."

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