George Bush Sr acts as witness at same-sex wedding

Former US President George Bush Sr has served as an official witness at the same-sex marriage of two long-term friends.

Helen Thorgalsen, who married her partner Bonnie Clement, posted a picture on Facebook of Bush Sr signing some documents with the comment: "Getting our marriage licence witnessed!"

Former President George Bush Sr signs the couple's marriage documents. Credit: Facebook/Helen Thorgalsen

Ms Clement told The Washington Post they have known the former president and his wife Barbara for years and they are "blessed to be in their lives".

The couple were married in Maine, which legalised same-sex marriage in December last year.