Heidi Klum's daughter Leni, 19, wears thong bikini on Italian vacation

Heidi Klum's daughter, Leni, 19, is still soaking up the rays in a teeny bikini while vacationing with her boyfriend, Aris Rachevsky, in Italy.

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

Heidi Klum's daughter Leni, 19, stuns in a black bikini as she cuddles up to her boyfriend Aris Rachevsky in Italy

Heidi Klum's daughter Leni, 19, wears thong bikini on Italian vacation

Heidi Klum's lingerie pic with teen daughter Leni slammed as 'inappropriate

Leni Klum and Mom Heidi Klum TWIN In New Lacy Lingerie Campaign

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Heidi Klum's daughter Leni, 19, looks incredible in a bright red two-piece as she and boyfriend Aris Rachevsky soak up the sun in Italy

Heidi Klum's daughter Leni, 19, goes boating in blue bikini

Heidi Klum's mini-me daughter Leni channels her inner supermodel: PHOTOS

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Heidi Klum's daughter Leni, 19, goes boating in blue bikini

Heidi Klum's daughter Leni, 19, looks incredible in a bright red two-piece as she and boyfriend Aris Rachevsky soak up the sun in Italy

Heidi Klum and daughter Leni, 18, slammed for 'weird' and 'disturbing' lingerie ad

Heidi Klum's daughter Leni, 19, showcases her toned physique in lacy underwear

Heidi Klum's daughter Leni, 19, pairs bronze bikini with sheer lace pants