By Archana Ram
Updated December 20, 2009 at 02:51 PM EST

Kevin Jonas, 22, married girlfriend Danielle Deleasa, 23, Saturday at Oheka Castle, a French-style estate in Long Island, according to People. The 400 guests were made up of family members and friends, including Demi Lovato, with brothers and band mates Joe and Nick serving as Kevin’s best men.