The "Glee" cast will return for Season 4, but for how long?

According to The Hollywood Reporter, all 15 regular cast members -- Lea Michele, Cory Monteith, Chris Colfer, Matthew Morrison, Jane Lynch, Jayma Mays, Naya Rivera, Heather Morris, Kevin McHale, Darren Criss, Amber Riley, Jenna Ushkowitz, Dianna Agron, Mark Salling and Harry Shum Jr. -- will return to the Fox musical series. However, the episode count for each remains undetermined and should allow the cast to explore other projects.

THR reports Chord Overstreet is in talks to be added as a series regular. Overstreet joined the series during Season 2, left at the end of the season after being passed up for regular status and returned in a recurring role during Season 3.

Series co-creator Ryan Murphy said he extended invites to the entire cast to return. "We've become like a family," he told Vulture. "I said to them anybody who wants to stay on the show will stay on the show. I asked all of them, 'What do you want to do? What are you interested in doing?'"

Season 4 will see guest appearances by Kate Hudson and Sarah Jessica Parker. Hudson will play Rachel's (Lea Michele) dance instructor and Parker is playing a manager of sorts to Kurt (Chris Colfer). "American Idol" runner-up Jessica Sanchez is also rumored to appear in multiple episodes.

"Glee" returns to Fox in its new timeslot, Thursdays at 9 p.m. ET, on Thurs., Sept. 13.

Re-live "Glee" Season 3 by clicking through the slideshow below.

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  • "All Or Nothing"

    "All Or Nothing"

  • "All Or Nothing"

    "All Or Nothing"

  • "All Or Nothing"

    "All Or Nothing"

  • "All Or Nothing"

    "All Or Nothing"

  • "All Or Nothing"

    "All Or Nothing"

  • "All Or Nothing"

    "All Or Nothing"

  • "All Or Nothing"

    "All Or Nothing"

  • "Wonder'ful"

    "Wonder'ful"

  • "Wonder'ful"

    "Wonder'ful"

  • "Wonder'ful"

    "Wonder'ful"

  • "Wonder'ful"

    "Wonder'ful"

  • "Wonder'ful"

    "Wonder'ful"

  • "Wonder'ful"

    "Wonder'ful"

  • "Lights Out"

    "Lights Out"

  • "Lights Out"

    "Lights Out"

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Naked"

    Chord Overstreet as Sam Evans strikes a pose.

  • "Naked"

    The glee club puts together a calendar photo shoot to raise money for Regionals in the "Naked" episode.

  • "Thanksgiving"

    Amber Riley, Cory Monteith, Mark Salling, Dianna Agron, Harry Shum Jr., and Naya Rivera.

  • "Thanksgiving"

    Marley (Melissa Benoist, C) has a conflict in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    Ryder (Blake Jenner, L) and Jake (Jacob Artist, R) work together in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    The Warblers perform in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    New Directions perform in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    New Directions perform in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    Joe (Samuel Larsen, L) and Sugar (Vanessa Lengies, R) perform in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    Kurt (Chris Colfer) celebrates Thanksgiving in New York in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    Kurt (Chris Colfer, L) and Rachel (Lea Michele, R) celebrate Thanksgiving in New York in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    Brittany (Heather Morris, L), Quinn (Dianna Agron, C) and Santana (Naya Rivera, R) perform in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    McKinley High's alumni return as mentors to the current glee club members in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    McKinley High's alumni perform in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    Quinn (Dianna Agron, ) chats with brothers Puck (Mark Salling, L) and Jake (Jacob Artist, R) in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    Quinn (Dianna Agron, L) gives Kitty (Becca Tobin, R) some advice in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    Kurt (Chris Colfer, R) invites Isabelle (guest star Sarah Jessica Parker, L) over for Thanksgiving in New York in the "Thanksgiving" episode of "Glee."

  • "Thanksgiving"

    Kurt invites Isabelle (guest star Sarah Jessica Parker) over for Thanksgiving in New York in the "Thanksgiving" episode of "Glee."

  • "Glee, Actually"

    Brittany (Heather Morris) passes out gifts in the "Glee, Actually" episode of "Glee."

  • "Glee, Actually"

    Puck (Mark Salling) and Jake (Jacob Artist) have a brotherly conversation in the "Glee, Actually" episode of "Glee."

  • "Glee, Actually"

    Sue (Jane Lynch) gets into the holiday spirit in the "Glee, Actually" episode of "Glee."

  • "Glee, Actually"

    Marley's mom, Mrs. Rose (Trisha Rae Stahl) and Sue (Jane Lynch) watch a performance by the glee club in the "Glee, Actually" of "Glee."

  • "Swan Song"

    Kurt (Chris Colfer) begs for another chance to audition at NYADA in the "Swan Song" episode of "Glee."

  • "Swan Song"

    Whoopi Goldberg guest-stars as Carmen in the "Swan Song" episode of "Glee."