Justin Bieber took it off onstage during Fashion Rocks 2014 on Tuesday. While introducing Rita Ora with model Lara Stone, the pop heartthrob stripped down to his Calvin Klein boxer briefs, giving his fans plenty to scream about.

“I actually don’t feel comfortable unless I’m in my Calvins,” he said before undressing.

According to The Guardian, Bieber is working on an acoustic duets album with Aussie singer Cody Simpson for release in November.

See the Biebs in the buff.