Heidi Klum's Daughter Leni Stuns in Bikini Aboard Father's Yacht

Heidi Klum's daughter definitely got it from her mama ... looking absolutely stunning in a skimpy swimsuit as she vacations on her father's luxury yacht.

Leni Klum slipped into a tiny blue and orange bikini Wednesday for a boat day in the South of France with her biological dad, ex-Formula One team manager Flavio Briatore.

As you can see, the 19-year-old model has curves for days, proving those Klum genes are strong!!!

When Leni wasn't working on her tan or generally looking hot as hell, she was jumping off the boat into the beautiful blue Mediterranean water ... and it seems everyone on board was having a blast.

Leni being on Flavio's boat is notable too, and not just because of her swimwear.

Heidi's eldest did not have her biological dad in her life for much of her upbringing, though they reconnected a few years back and from the looks of this outing ... they're getting along well.

Mom being one of the most famous and successful models ever means Leni's got some big ... shoes to fill.