Former President George H.W. Bush and his wife, Barbara, were the official witnesses of a same-sex marriage between two women in Maine over the weekend, a spokesman said on Wednesday.

The former first couple witnessed the private ceremony on Saturday in Kennebunk between Bonnie Clement and Helen Thorgalsen, according to Jim McGrath, a Bush spokesman.

Clement posted a photograph on her Facebook page of President Bush signing a piece of paper as the couple, close friends of the Bushes, watched and held champagne glasses.