Justin Bieber stripped down to his underwear – Calvin Klein of course – live on air during Tuesday night’s Fashion Rocks show after the crowd booed him.

Justin Bieber Strips Down To His Underwear

Bieber took the stage with model Lara Stone to introduce a performance by Rita Ora when the unplanned strip show occurred. The crowd at Brooklyn’s Barclays Center reportedly booed loudly when the singer walked out, inspiring Bieber to start taking off his shoes, pants and t-shirt.

“I don’t feel comfortable unless I’m in my Calvins. So, what’s up? Is that cool?” Bieber said as he undressed.

Stone watched on as Bieber stripped almost completely, revealing his tattooed arms and six-pack abs in black Calvin Klein briefs. “Is that better?” he asked Stone when he was finished.

“So much, thank you Justin,” Stone replied.

Bieber shared his strip tease with fans on Twitter and Instagram, admitting that the stunt “wasn’t planned.”

“Grandma always said kill ‘em with kindness…and then strip on live national tv. Lol,” Bieber wrote on Twitter.

Bieber has stripped in public before. In fact, the singer frequently posts shirtless photos of himself to his official Instagram account.

Bieber wasn’t the only one showing some skin at the Fashion Rocks show. Performer Jennifer Lopez teased fans during the performance of her new song “Booty,” flashing a glimpse to her infamous rear to the audience.