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The X Factor alums were the first to mock the Biebs, but hopefully they won't be the last. "Hey @justinbieber, we're in Canada ready for the jam sesh!" the trio tweeted.
Back in the day, playing naked on stage was part of the Red Hot Chili Peppers bassist's shtick.
The singer-songwriter stripped for Jane magazine in 2005.
John Mayer's lifelike concert hologram had a nude setting in a 2012 CollegeHumor video.
The country star and American Idol judge showed everything but down under for a 2001 Playgirl spread — a fact Jay Leno teasingly brought up on The Tonight Show earlier this year.
The British pop group had a sexy strum in Cosmo U.K. earlier this summer to raise awareness for cancer research.
Are you gonna go his way? Of course Lenny once posed naked with a guitar — and a snake.
The British pop-rockers have been dropping trou for many years, but they did it with musical flair in a 2007 issue of Attitude.
The Missing Persons and Duran Duran rocker was comfortable with nudity long before he dabbled in porn.