L.A. Reid, Demi Lovato, Britney Spears and Simon Cowell L.A. Reid, Demi Lovato, Britney Spears and Simon Cowell

Britney Spears and Demi Lovato will officially make their  X Factor judging debuts on Wednesday, Sept. 12 at 8/7c as part of the show's two-night, three-hour season premiere, Fox announced Monday. The second part of the singing competition's premiere will air Thursday, Sept. 13 at 8/7c.

Glee will assume its new date and time beginning on Thursday, Sept. 13 (following The X Factor) at 9/8c. As previously reported, the fourth season of the drama will feature Kate Hudson and Sarah Jessica Parker in multi-episode arcs — though there is no word yet on whether they'll appear in the premiere.

Returning drama Bones kicks off its new season on Monday, Sept. 17 at 8/7c, while the final season of Fringe begins on Friday, Sept. 28 at 9/8c.

Sarah Jessica Parker, Kate Hudson to guest-star on Glee

Friday, Oct. 26
8/7c: Touch
9/8c: Fringe

* denotes new show