Disney star Sabrina Bryan is the thirteenth and final celebrity to join season 15 of Dancing with the Stars: All Stars, set to kick off Sept. 24. "It's just a huge honor that the fans for the first time ever got the chance to vote for someone on the show and cast their favorite person," Bryan said. "It just means a lot to me that my fans, since my early elimination, have really supported me." The 27-year-old beat out Kyle Massey and Carson Kressley for the coveted spot to compete against other DWTS all-stars. Bryan will team up with professional dancer Louis Van Amstel to compete for the mirror ball trophy. It's not her first time dancing with the Dutch-American ballroom champion. Bryan thinks season eight winner Shawn Johnson will be her biggest competitor. "You know, anyone who gets put with [professional dancer] Derek Hough is one to look out for," Bryan said of Johnson's pairing. "I think they're definitely a team to beat." "Everybody is good this season so when you win -- if you're in the final in this one -- you're the true champion," Van Amstel added.