Washington (CNN) Vice President Joe Biden on Monday officiated his first wedding ever, for two longtime White House staffers.

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

Proud to marry Brian and Joe at my house. Couldn't be happier, two longtime White House staffers, two great guys. pic.twitter.com/0om1PT7bKh — Vice President Biden (@VP) August 1, 2016

His office said the vice president obtained a temporary certification from the District of Columbia to preside over the wedding ceremony, which was attended only by the grooms' families. It took place in the living room of his home at the U.S. Naval Observatory in Washington.

The newlyweds are Brian Mosteller, director of Oval Office operations for President Barack Obama, and Joe Mahshie, a trip coordinator for first lady Michelle Obama.

Biden's wife, Jill, later tweeted: "Love is love!"

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