(Hip-O/Amazon.com)

Olivia Newton-John and John Travolta were unforgettable together in "Grease" - not just their acting, but their singing as well. Now, the two iconic stars have re-teamed for a special project: a charity Christmas album that marks their first time recording together in nearly 35 years.

The disc, This Christmas, will be in stores Nov. 13, and it's quite the star-studded project. In addition to Newton-John and Travolta, the album features guest appearances by Barbra Streisand, Tony Bennett, James Taylor, Kenny G, Cliff Richard and jazz legend Chick Corea.

The songs on the album are holiday standards, except for one original, "I Think You Might Like It," written by Jay Farrar, the guy who wrote Newton-John and Travolta's beloved Grease duet "You're the One that I Want." The new song is described as something of a sequel to that classic.

In fact, "You're the One That I Want" is the reason this project came about. Last Christmas, Newton-John texted Travolta to tell him that the song had become the best-selling duet in pop music history. The idea for the album came from there. Travolta said in a statement, "From the moment we decided to do this, magic happened. Everyone we contacted agreed to do it."

"It just fell into place," said Newton-John. "With our busy schedules, I don't know how we got it done. John and I have always connected. That's never gone away. When we're together, we have a good laugh and feel bonded to one another. We've been through some amazing experiences together."

Speaking about their concept for the disc, Travolta said, "I wanted people to be able to play it around the house or in the car during the holidays, and make us part of your celebration. Gathering around house listening to Christmas music has always been an important part of that time of the year to my family."

Proceeds from the disc will benefit two charities near and dear to the stars' hearts: Travolta's Jett Travolta Foundation, which combats children's disabilities, and the Olivia Newton-John Cancer and Wellness Center in Melbourne, Australia, which helps cancer victims and funds research for a cure.