Candice Swanepoel -- Bathing Booty!

While swimming near the shore in Miami, Victoria's Secret supermodel Candice Swanepoel's bikini was nearly swallowed up ... by her own amazing ass.

With her heavenly yellow bikini bottom fighting to stay afloat, the 24-year-old South African stunner soaked her gorgeous curves in the warm waters of South Beach this weekend.

Luckily no one drowned ... watching Candice come out of the water.