'The Hangover' Star Zach Galifianakis Heading Down the Aisle

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"The Hangover Part III" might be about Zach Galifianakis' character busting out of the looney bin and spending one wild week in Tijuana with Bradley Cooper and Ed Helms, but Part IV will be all about Galifianakis' own nuptial madness.

We kid, but it is true that Galifianakis is getting hitched (oh, to be a fly on that bachelor party wall)!

Celebuzz reports that Galifianakis, 42, and long-time girlfriend Quinn Lundburg, 29, are now engaged and have already sent out their kooky invites for the Aug. 11 event, equipped with "a drawing of himself and his bride-to-be" in which "he looked like a little troll, while Quinn is a stunning tall blonde princess."

Galifianakis might've made light of the invites, but he's reportedly turning the gift option into a serious affair. Apart from requesting some Anthropology sheets, the funnyman, whose Twitter feed is practically a stream of PSAs and call-to-action requests, is encouraging guests to donate to Growing Voices, his gal's non-profit organization which supports local development and reconstruction, in lieu of gifts for the couple.

Zach Galifianakis and Quinn Lundburg alternate between living in his home state of North Carolina and Venice, California.

In addition to the third and final "Hangover" installment, Galifianakis will next be seen in August's "The Campaign," co-starring Will Ferrell and Jason Sudeikis.