Guess The Busty Babe Breakin' A Sweat In The Sauna

Tuesday's turnin' up with a sexy star who ain't afraid to show some sweat in the sauna ... but do you know who she is?

This gorgeous gal -- who was once linked to Michael B. Jordan -- has walked some major fashion runways for major designers like Dolce & Gabbana.

Her stepdad is a super famous comedian and TV talk show host.