This Sexy Rock Star Once Took a Naked Bathtub Pic With His Brother! Who Is He? (PHOTO)

The Voice coach and Maroon 5 frontman is known for frequently taking off his shirt, but his brother, Michael Levine, shared an even more revealing photo on Instagram.

“In the bath...lol! ADAM LEVINE NAKED!” he wrote.

Well, Michael certainly knows how to give the fans what they want!

Were you able to guess that it was Adam? Tell us below, and click here to play more “Guess Who?”