Vice President Joe Biden officiated his first wedding Monday night, for a same-sex couple.

Brian Mosteller and Joe Mahshie, two longtime White House staffers, were married by Biden at the Naval Observatory on Monday, the vice president's office said.

"Proud to marry Brian and Joe at my house. Couldn't be happier, two longtime White House staffers, two great guys," Biden wrote in a tweet, which included a photo of the ceremony.

Biden's wife, Jill, then retweeted her husbands tweet and added, "Love is love!"

According to Biden's office, he obtained a temporary certificate from the District of Columbia so he could legally perform his first-ever wedding ceremony for the two men.

Biden was an early backer of same-sex marriage, and said he supported in in 2012. President Obama announced he too supports same-sex marriage just days after Biden announced his position on national television.