Kevin Jonas Gets Hitched!

Sorry, girls: Kevin Jonas is officially off the market!

The Jonas Brothers singer, 22, married his longtime girlfriend Danielle Deleasa Saturday in Long Island, New York, Usmagazine.com has confirmed.

"It was beautiful," a source tells Us.

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The singer's ceremony took place at Long Island's Oheka Castle, which also hosted the nuptials of *NSYNC's Joey Fatone and was featured in the Cameron Diaz-Ashton Kutcher flick What Happens in Vegas. Eonline reports that the snowy 5pm ceremony was attended by 400 -- including his brothers and bandmates, Nick and Joe, along with the brothers' good pal, Demi Lovato. Nick and Joe served as the best men.

How did Jonas propose to the former hairstylist, 22, whom he met on a trip to The Bahamas in 2007?

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He surprised her last July by showing up on her New Jersey doorstep with a three-carat solitaire cushion-cut diamond surrounded by 210 round, brilliant-cut pave diamonds. He designed the ring himself, with help from Jacob the Jeweler. "She said yes, yes, yes like 500 times super fast in a row," he said.

The sparkler wasn't the first ring Jonas picked out. In 2008, he told Details he was waiting until marriage to have sex -- and was wearing a promise ring from Tiffany's in the meantime.

Jonas says he's excited to become a married man -- if only for the home cooked meals!

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"She makes this chicken parm that’s legitimately unbelievable! She makes a good pasta, too. She's a good hometown Italian girl," he told the New York Daily News of Deleasa's culinary skills.

Last month, it was announced the brothers' Disney Channel series, J. O. N. A. S., had been picked up for a second season.