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

Fox's new Tuesday comedy block will debut on Tuesday, Sept. 25, with the return of New Girl (9/8c) and the series premieres of Ben and Kate (8:30/7:30c) and The Mindy Project (9:30c/8:30c).

Check out Fox's complete fall schedule here:

Wednesday, Sept. 12
8/7c: The X Factor

Thursday, Sept. 13
8/7c: The X Factor
9/8c: Glee

Monday, Sept. 17
8/7c: Bones
9/8c: The Mob Doctor*

Tuesday, Sept. 25
8/7c: New Girl (special episode)
8:30/7:30c: Ben and Kate*
9/8c: New Girl
9:30/8:30c: The Mindy Project*

Friday, Sept. 28
9/8c: Fringe

Sunday, Sept. 30
8/7c: The Simpsons                                       
8:30/7:30c: Bob's Burgers
9/8c: Family Guy
9:30/8:30c: American Dad

Tuesday, Oct. 2
8/7c: Raising Hope
8:30/7:30c: Ben and Kate
9/8c: New Girl
9:30/8:30c: The Mindy Project

Tuesday, Oct. 2
7:30/6:30c: The Cleveland Show
8/7c: The Simpsons                                       
8:30/7:30c: Bob's Burgers
9/8c: Family Guy
9:30/8:30c: American Dad

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

* denotes new show