ET takes you inside the rehearsals for the professional dancers of ABC's hit show "Dancing With The Stars," and we unveil three new pros who will be competing this season. Plus, Julianne Hough talks about touring with country music star Brad Paisley, and brother Derek Hough addresses those Shannon Elizabeth engagement rumors! "It's been pretty crazy," Julianne says of rehearsals. "I've actually had to stop touring with Brad Paisely because the show has started. I've started training already!" The show announced its thirteen new stars for the season earlier today and they will be teaming up with the professionals, including veterans Julianne and Derek, Alec Mazo, Cheryl Burke and Mark Ballas.