It's official -- Kevin Jonas is off the market! Kevin and his fiancé Danielle Deleasa tied the knot today at a castle in Long Island in front of 400 people, including Demi Lovato. (See pictures of the beautiful castle here.)

The wedding took place in huge (and heated -- it's snowing like crazy in Long Island!) white tents that looked like a fairytale forest, complete with 14-foot trees covered in hydrangeas and crystals made to look like icicles.

Danielle wore a strapless Vera Wang gown and a silk and crystal flower in her hair because when Kevin met Danielle in the Bahamas in 2007, she was wearing a flower in her hair. The couple exchanged Jacob & Co. rings they designed for each other -- Jacob & Co. also made Danielle's gorgeous engagement ring.

As J-14 previously reported, Joe and Nick were his best men and Danielle's two sisters served as her maids of honor.

Congrats to the happy couple! Send the new Mr. & Mrs. Jonas your best wishes!

Photo: Courtesy of the Jonas Family