@mariotestino / Instagram 1 / 10
@mariotestino / Instagram 1 / 10

Gigi Hadid isn't afraid of showing off her body.

Last week, Hadid flaunted her bikini bod at a Victoria's Secret event in Miami. This week, she's baring even more: The 19-year-old model appeared nude alongside boyfriend Cody Simpson, with the couple covered by only a towel.

The photo, which was posted to Instagram on Friday, is part of Peruvian fashion photographer Mario Testino's "towel series."

NEWS: Kendall Jenner and Gigi Hadid Go Makeup-Free on Marc Jacobs Runway

Previously, the esteemed photographer has featured Kate Moss, Miley Cyrus, Ansel Elgort, Sienna Miller, Kendall Jenner, Cristiano Ronaldo, and Lily Aldridge. Hadid and Simpson (an Australian actor and pop singer) are the first couple to appear together in the "towel series."

PICS: Celebrity Offspring Who Became Models

Hadid, whose mom is "Real Housewives of Beverly Hills" star Yolanda Foster, was recently criticized for a Snapchat video taken by Simpson where it looked like she was bending down to snort cocaine. She has denied the allegations.