Sylvester Stallone Vacations with Wife and Daughters on Yacht in France

Sylvester Stallone and his brood were living it up on the French Riviera ... making everyone who's not there extremely jealous.

Sly, along with Jennifer Flavin and his 3 daughters Sistine, Sophia and Scarlet, were the picture of beauty on yacht. Kinda goes without saying the women gorgeous. That's 21-year-old Sophia is in the copper-colored metallic bikini ... as they say in the law -- res ipsa loquitur. Look it up.