Zach Galifianakis is set to marry this summer.

The 42-year-old Hangover star and his long-term girlfriend Quinn Lundberg, 29, have sent out invitations to the big day in August, Celebuzz reports.

"The wedding invite is very Zach," an insider revealed.

"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."

Their wedding list has very few items on it but instead the couple have asked guests to donate to Growing Voices, an organisation which Quinn co-founded which - among other projects - supports victims of domestic violence.

The wedding is set to take place on August 11.