Justin Bieber Shirtless for "Towel Series" By Mario Testino

Justin Bieber proudly showed off his bare naked body and his tight muscles in a hot shot from Mario Testino’s iconic ‘Towel Series.’

Kendall Jenner, Gigi Hadid and Justin Bieber are the latest stars to be snapped wearing nothing but fluffy white towels in shots uploaded to celebrated fashion photographer Mario Testino's Instagram account.