THE X FACTOR
Fox, 8:00 p.m. ET
SEASON PREMIERE: Part 1 of 2. For its second season, X Factor grand pooh-bah Simon Cowell has retained fellow host L.A. Reid, but otherwise cleared the decks to make room for two new female judges: young singer and tween TV star Demi Lovato and former pop-princess icon, Britney Spears. As kids, both Spears and Voice judge Christina Aguilera once co-starred on The New Mickey Mouse Club. Now their career paths cross again — this time as prime-time TV rivals.