NEW YORK — Kevin Jonas is a married man!

The 22-year-old singer and his longtime girlfriend, Danielle Deleasa, tied the knot Saturday at Oheka Castle in Long Island, American Superstar has learned.

Fellow Jonas Brothers Nick and Joe served as best men at the evening affair, which took place in front of approximately 400 friends and family.

"We're so happy that we're finally married and we were able to share the special moment with family, friends and loved ones," the couple told People.

Jonas proposed to the 23-year-old Deleasa in July.

The couple first met while vacationing with their families in the Bahamas in 2007.