'Gossip Girl' Star Penn Badgley Marries Domino Kirke in Brooklyn Ceremony -- See the Pics!

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A Gossip Girl guy is off the market!

Penn Badgley has married Domino Kirke, sister of Girls star Jemima Kirke, a rep for the couple confirms to ET.

The actor-musician notable for his role on the CW series, married his musician-doula wife in front of family in Brooklyn on Monday, the rep reveals.

On Monday, several social media posts suggested the couple's nuptials.

"Congratulations ya s**theads!" Jemima tweeted on Monday. " @PennBadgley and @DominoKirke it's all downhill from here. In a good way!"

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The couple was married in a Brooklyn, New York, courthouse, before a small group of family and friends, E! Newsreports. And the good news about the low-key wedding -- guests were free to dress down!

"When someone gets married in a courthouse, it's really an open invitation to everyone but the beautiful bride to explore all that fashion has to offer," Domino's other sister, Lola Kirke, shared on Instagram. "Here, I try a look simply called 'Pants,' as Cassius goes for 'That Dude from #incubus' and Jemima experiments with 'Off to Therapy!' Congratulations @dominokirke. We love you."

"Congrats to a couple beautiful people," another friend said, celebrating the occasion.

MORE: 'Girls' Star Jemima Kirke Says Acting Led to Her Divorce: 'I've Learnt a Lot More About Myself'

Penn previously dated his Gossip Girl co-star, Blake Lively.

Meanwhile, as Penn and Domino celebrate their Brooklyn marriage, Jemima's own relationship with the New York borough -- at least as it pertains to HBO's Girls -- is coming to an end at the conclusion of the sixth season.

Watch the video below for how the cast has said goodbye, as well as whether a movie may be in the future.