'Glee': Olivia Newton-John and Jane Lynch get 'Physical'

olivia-newton-john-jane-lynch.jpg"Grease" sweetheart Olivia Newton-Johnson is track-suiting up with Jane Lynch on "Glee" this spring.

Ryan Murphy tells ET Online that Olivia Newton-John is making a guest appearance on "Glee" once the show returns in April.

There is no word yet on what her specific role will be, but Murphy says Olivia will be singing her 1981 hit "Physical" with Jane Lynch's Sue Sylvester. We hope there are some Cheerios doing stunts and gymnastics in the background.

"Glee" better make room for more guest-stars -- it has been renewed for a second season and we think the vocally-talented stars will be lining up to appear, joining the ranks of already-guested Kristin Chenoweth, Eve, Josh Groban. Broadway star Idina Menzel is also slated to appear in the second half of "Glee's" first season.

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Photo credit: WireImage