Publicist Bianca Bianconi confirmed Wainwright and Jorn Weisbrodt were married in a ceremony Thursday.
People reports the 39-year-old musician and the artistic director of the Luminato Festival were married by close friend and artist Justin Vivian Bond in a ceremony in Montauk on Long Island.
Wainwright and Weisbrodt have a 1-year-old daughter together in a parenting partnership with Lorca Cohen, daughter of Leonard Cohen. Wainwright and Weisbrodt were engaged in 2010.
People says a number of celebrities attended the wedding, including Alan Cumming, Julianne Moore, Yoko Ono and Sean Lennon, Antony Hegarty, Lou Reed, Carrie Fisher and producer Mark Ronson, who also assisted with DJ duties during the reception.