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 holidays in France: Photos

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

Heidi Klum and daughter Leni, 19, show off model figures in matching red lingerie for racy new Intimissimi photoshoot

Leni Klum Shares Sweet Smooch in Green Bikini on Vacation

Heidi Klum's daughter Leni, 19, wears green bikini while in France

Leni Klum's White Bikini on Instagram

Heidi Klum's daughter Leni, 19, wears green bikini while in France

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

Heidi & Leni Klum x Intimissimi: Fall / Winter Lingerie - Campaign, Video & Looks - FIV

Heidi Klum shows off bikini body in new photos from Italian family vacation

Heidi Klum and Daughter Leni Star in Lingerie Campaign for Intimissimi