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Zach Galifianakis, Quinn Lundberg

David Livingston/Getty Images

The Wolf Pack apparently has yet another reason to celebrate.

Zach Galifianakis, 42, is said to be engaged to his 29-year-old girlfriend, Quinn Lundberg.

While The Hangover star's rep would not confirm the upcoming nuptials with E! News, Celebuzz reports that the couple will not only tie the knot on Aug. 11, but they have already sent out the wedding invitations.

"The wedding invite is very Zach," a source told the website. "While it has the formal and standard details of who, what, when and where - including Zach's full name Zachary Knight Galifianakis and his fiancée's Mary Quinn Lundberg - it is also very funny. Zach included a drawing of himself and his bride-to-be. He made sure he looked like a little troll, while Quinn is a stunning tall blonde princess."

The couple is reportedly asking guests to donate to Growing Voices, a charity organization cofounded by Lundberg.