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Olivia Newton-John has been hopelessly devoted to her “Grease” wardrobe for decades, but she is now giving up the iconic looks for a good cause.

“I don’t feel I’m parting with them,” she told Page Six Style. “I have a photograph of them, which is probably better than having it in the closet, and I feel like I’ve had my time with them. I’m happy that it’s going to go to people that will enjoy it.”

Proceeds from the auction, run by the California-based Julien’s Auctions and set for November 2, will benefit the Olivia Newton-John Cancer Wellness and Research Centre in Melbourne, Australia — a public hospital that treats cancer patients, conducts research and clinical trials.

Newton-John, 70, told us she always thought of auctioning off her character Sandy’s all-black outfit, but wasn’t able to do so before because she was “going through my own kind of journey.”

In September 2018, the actress confirmed she was battling cancer for a third time; she was first diagnosed with breast cancer in 1992.

Despite her health issues, the “Physical” singer said she is “really well” and plans to travel to Ireland next month for an exhibition of her famous wardrobe at the Museum of Style Icons on July 22 and 23. The official auction will then take place in Beverly Hills and online on November 2.

“I’m really excited about it!” she said. “It’s a very famous museum.”

Newton-John’s auction began with just a few items from “Grease,” but the collection quickly grew to up to 200 costumes, gowns and household items, like her furniture and piano.

“It’s been really fun actually just kind of clearing house,” she said.

Some of her more well-known pieces for sale include her “Grease” Pink Ladies jacket and pants, Xanadu boots, “Physical” outfits and the pink prom dress she wore to a movie premiere in Los Angeles in 1978.

However, before giving up Sandy’s finale look, Newton-John confessed to us that she had to try on the pants, which she said are made of sharkskin, one final time last year.

“I thought I’d have one last go and throw them on, and I actually could,” she said. “I had lost weight, so it kind of worked well. I just needed to know I could get my legs in.”