Gossip Girl's Penn Badgley secretly marries Domino Kirke, is Lonely Boy no more

XOXO!

Gossip Girl star Penn Badgley, who played Dan Humphrey on the hit show, is officially a married man.

Penn tied the knot with long-time love Domino Kirke in a low-key Brooklyn, New York, courthouse ceremony on February 27. And the duo's friends and family quickly shared their wedding excitement on social media.

"Congratulations ya s---heads," Domino's sister and Girls star Jemima Kirke tweeted. "It's all downhill from here. In a good way!"

While Domino, 33, wore a traditional white lace dress and the groom, 30, donned a navy suit, the guests let loose a bit more with their fashion choices.

"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, posted 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."

Penn and Domino, who has a child with her ex, have been dating since 2014. He was previously involved with Zoe Kravitz and Blake Lively.