Nick Carter, 35, a singer with the Backstreet Boys, is originally of New York and has performed on reality television shows in a family reality show called "The Carters."
ABC has also announced many of the professional dancers that will join the show this season, and fans will recognize some familiar faces.
PHOTOS: Dancing with the Stars season 21 professional dancers
The celebrity cast announcements will continue all week long.
Dancing with the Stars season 21 will premiere Sept. 14 on ABC at 8 p.m. ET | 7 p.m. CT.