Badonkadonk is right.

Kim Kardashian shakes what her mama gave her in a teeny purple-and-white striped string bikini while strolling down the beach with big sis and new mom, Kourtney in Miami.

The 29-year-old reality star, who told StyleList that she "loves fitness and working out," looked healthy and happy, still rocking her uber- famous booty.

Kim Kardashian -- along with her two sisters -- is the face of QuickTrim, and says that she uses the weight-loss supplement to keep her body in tip-top -- or bottom -- shape.

Meanwhile, see which other star recently rocked a skimpy striped suit.