The Insider.com

Add Sarah Jessica Parker and Kate Hudson to the long list of celebs to grace the halls of McKinley High.

• May 13, 2012Dane Cook Looks for His 'Next Caller'
• May 12, 2012Is Your Favorite TV Show Coming Back?
• May 11, 2012Anna Chlumsky: 'Veep' Could Happen!
• May 11, 2012Whitney's Family to Star in Reality Show
• May 11, 2012'Once' Creators Preview The Finale!
• May 11, 2012'Undercover Boss' Gets Hazed By Employees

The A-list ladies will make guest appearances on the fourth season of Glee, with Hudson getting a six-episode arc.

Related: 7 'Glee' Songs That Improve on the Original

As for Parker, Chris Colfer just revealed that the Sex and the City star will be playing his mentor -- and that despite rumors, he's staying on for another season of the hit show.

"I never said I was leaving the show. I'm staying on and I just found out last night that Sarah Jessica Parker is coming on the show to be my mentor of sorts, so I'm really excited about that," Chris revealed on Live! with Kelly.

Related: First Look -- Lohan on 'Glee'

Hudson will also play a mentor figure, but to Lea Michele's character Rachel, Michele just told The Insider.

Glee moves to a new night and time this fall to Thursdays, 9 p.m., following The X Factor on FOX.