The X Factor (US): Season 3, Episode 7

3 - 7:

The competition continues to heat up on THE X FACTOR as judges Simon Cowell, Demi Lovato, Kelly Rowland and Paulina Rubio reveal which of the four categories - Girls, Boys, Over 25s and Groups - each of them will mentor. Host Mario Lopez introduces a new round of the competition as each contestant sings for a coveted spot on the giant X stage - and a spot in the Top 16! See how your favorites stack up