Mitzi Gaynor -- Ancient Hottie Selling Bev Hills Mansion

Good news Mitzi Gaynor fans ... the Hollywood icon (famous for singing about washing some dude out of her hair in "South Pacific") is selling her massive Beverly Hills home.

The home is great ... 5 beds, 6 baths, pool, 4,100 square feet -- and it can all be yours for a cool $5.5 million.

Fun Fact -- Mitzi is 82. The home is 84.

Now, for your viewing pleasure .... here's Mitzi singing in "South Pacific."