Christina Aguilera, Britney Spears Christina Aguilera, Britney Spears

X-Tina and Britney are going head-to-head once again, but this time it's not on TRL or the record charts.

The Voice, which premieres Monday at 8/7c on NBC, will expand to Tuesday and Wednesday as well, pitting the third-year singing competition against the Season 2 premiere of The X Factor.

The Voice exclusive preview: "Season 3's bigger in every way"

Fox's talent contest premieres with a two-hour episode on Wednesday at 8/7c, and will mark the debut of new judges Spears and Demi Lovato. Monday's season premiere of The Voice will run as a two-hour show, while the Tuesday and Wednesday editions (8/7c) will span an hour each.

NBC is also hoping to capitalize on the success of The Voice by airing the series premiere of the freshman comedy The New Normal on Monday at 10/9c immediately following The Voice's season premiere, when a new episode of Grimm was scheduled to air. The New Normal will then air a new episode at its regular timeslot of Tuesdays at 9:30/8:30c. Grimm will return with new episodes in its regular Fridays at 9/8c timeslot on Sept. 28.

Which singing competition will you be watching next week?