Marilyn Monroe relied on a surprising medicine-cabinet staple to keep her skin glowing and bright, a former acting-school classmate said.

The late, legendary bombshell apparently got into the habit of rubbing herself down with Vaseline before a long, steamy bath every day to keep her body hydrated.

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“Marilyn Monroe had the most luminous skin I ever saw,” said Renée Taylor at a recent event celebrating the 50th anniversary of the Lee Strasberg Theatre & Film Institute in New York, Page Six reports.

“She came into class with Lee Strasberg one day and I just had to ask what she did,” the actress and Oscar-nominated screenwriter continued, recalling her time as a classmate of Monroe's at the Actors Studio in New York. “Marilyn told me, ‘I rub my entire body down with Vaseline and then get into a three-hour hot bath every morning. It gives my skin a shiny glow.’”

Though the petroleum jelly supposedly worked wonders for the screen siren, Taylor — who was nominated for an Academy Award for screenwriting for "Lovers and Other Strangers," and also starred in "The Nanny" — admitted she didn’t quite have the same luck.

“So I tried that. I almost drowned,” she joked of the slippery trick.

This April 1962 file photo shows actress Marilyn Monroe on the set of her last movie,

Monroe, seen here in an April 1962 file photo on the set of her last movie, "Something's Got To Give," reportedly had a lengthy process for glowing skin. (AP)

Vogue previously reported that Monroe was known to layer Vaseline all over her face, beneath her makeup, to create a dazzling on-camera glow.

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Well ahead of her time, the actress also reportedly advocated for safe sun tanning.

“Despite its great vogue in California, I don’t think suntanned skin is any more attractive . . . or any healthier, for that matter. I’m personally opposed to a deep tan because I like to feel blond all over,” she said, according to the outlet.

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