Article continues below advertisementVittoria Ceretti's scuba diving adventures took a sultry turn.Leonardo DiCaprio's girlfriend bared her butt while swimming deep underwater on Saturday, November 15.Ceretti, 27, wore a tiny black thong and long-sleeved gray shirt, along with a scuba mask and flippers.Article continues below advertisementSource: @vittoria/InstagramVittoria Ceretti went scuba diving.When she wasn't in the water, she flaunted her toned tummy in the same bikini bottoms, paired with a white baby tee, at sunset.