Look out, Nick Carter! You won't be the only musician in the ballroom. Singer-songwriter Andy Grammer is the latest to sign on for Season 21 of Dancing with the Stars. Grammer made the announcement while chatting On Air with Ryan Seacrest.

Grammer then took to Facebook to explain that his decision to join the show is in honor tribute of his late mother, whose "eyes would light up" when she saw dance on screen, he wrote. Read his touching note, which comes with a warning to his competition: "Game on."

Nick Carter, Paula Deen and Chaka Khan join Dancing with the Stars

When I performed 'Honey, I'm Good' on Dancing with the Stars last season, it was obviously exciting and a thrill, but...

Posted by Andy Grammer on Monday, August 31, 2015

Grammer also made a cameo on Dancing last year, when Nastia Liukin and Sasha Farber danced a Charleston to "Honey, I'm Good."