12/29/2008 AT 11:40 PM EST
After two decades together, Woody Harrelson and his girlfriend Laura Louie made it legal on Sunday.
The 47-year-old actor and Louie, 43, "were officially married yesterday on the island of Maui," his rep tells PEOPLE.
The intimate ceremony was attended by family and friends.
The couple have three daughters, Makani Ravello, 2, Zoe Giordano, 12 and Denni Montana, 15. – Julie Jordan and Marla LehnerRELATED ARTICLE: 1990: Woody is one of PEOPLE's 'Most Beautiful'! RELATED GALLERY: From Ellen & Portia to Pete & Ashlee, go inside more celeb weddings!