LOS ANGELES (AP) — Backstreet Boy Nick Carter says he’s never been much of a dancer. That’s why he decided to do “Dancing With the Stars.” So far, he’s off to a good start on season 21 of the ABC show. He tied for highest score on last night’s season premiere. Carter had a bit of a wardrobe malfunction when the button on his pants popped. Among other musicians on the show, Tamar Braxton was just a point off the leaders’ pace and Andy Grammer scored in the middle of the pack. But Chaka Khan faces possible elimination. She was second-to-last on the judges’ leaderboard with her cha cha. The first eliminations of the season will come on next Monday’s show.