It's been known that Johnny Depp and Marilyn Manson have been friends for a really long time. The two became buds when they met on the set of the original 21 Jump Street TV series. It's only natural that the actor and musician would collaborate on a song together, but their choice is quite surprising. Manson and Depp have covered Carly Simon's 1972 pop hit, "You're So Vain", for the former's forthcoming album, Born Villain.

The shock rocker told MTV U.K. (via NME) that he wanted to do a cover with Depp that would be ironic for each other. Their rendition of "You're So Vain" will be included on Manson's eighth studio album, which is scheduled to be released May 1.

“He played drums and lead guitar," Manson reveals, "and I played guitar and sang. It’s a bonus track on my record and the video will probably be us looking at each other like a mirror."

Johnny won't be the only Depp on this endeavor. The Pirates of the Caribbean star's 9-year old son Jack will also be featured on the track.

“Johnny’s son Jack – whose birthday I’m gonna be performing at – was in the room and he actually played on the song too," Manson says. "It’s pretty cool.”

Can you imagine Marilyn Manson performing at your birthday party when you were 9? I can picture it now - Manson jumps into a ball pit, plays skee-ball and does a duet with Chuck E. Cheese.

GRD presents Marilyn Manson for a SOLD OUT show at The Orbit Room on May 6. The only way to get tickets is to win them from us. It's all part of the GRD Spring Concert Blowout.

Follow Dave Kim on Twitter and Tumblr.