*MADONNA'S DAUGHTER* IN *SEX ORGY* = NSFW 18+

Lourdes Leon, the Queen of Pop's oldest child, took a raunchy page from her mom's "Sex" book this weekend, performing nearly nude in a simulated orgy during Art Basel in Miami Beach, Florida.

The 23-year-old Leon started off Friday night's bacchanalia wearing a skin-tight tie-dye tank dress with a laced bodice, but soon ditched the outfit for a flesh-toned thong and nipple covers to join the heaving mass of bodies.

Video posted to Instagram Saturday morning by Peter Davis, editor in chief of the fashion magazine L'Officiel, shows barely dressed men and women writhing in ecstasy for five long minutes as onlookers wearing protective paper jumpsuits ogle the scene.