More Women of the '80s and '90s -- Then & Now

Jane Fonda never backs down from a challenge!

The 78-year-old star stops by "The Ellen DeGeneres Show" on Tuesday, where she gives the juicy details about her skinny-dipping session with the late Michael Jackson.

"Here's how it happened; he was visiting me when we were shooting 'On Golden Pond' and I had a little cabin on the lake," she reveals. "He stayed with me for about eight days and one night it was a full moon and he said lets go swimming. It was his idea!"

The "Grace and Frankie" star keeps talking, admitting that she decided to go swimming anyway, after she knew the King of Pop had forgotten his swimsuit.

But Jackson isn't the only star the Hollywood legend has taken a naked dip with -- she also had a swimming adventure with Greta Garbo!

"I was about 16 and my father had rented a house in the South of France," Fonda recalls, explaining that her stepmother always had celebrities over the house. "Then one day Garbo came and she said 'You wanna go swimming?' She came out with a robe and one of those serious, white, rubber caps… and dove in."

Check out the clip below to find out how Greta may have launched Jane's acting career!

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