The Insider.com

Yes, it's true -- you can actually buy Justin Bieber's "Johnson".

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The teen superstar is now auctioning off the snake he carried at the 2011 MTV Video Music Awards red-carpet -- you remember, the one he oh-so-cleverly named "Johnson"?

But at least his teenage boy humor is going to a good cause as he's donated the reptile to a celebrity auction and will hand over the proceeds to Pencils of Promise, an organization which funds schools in the poorest parts of the world.

Wonder if Mariah Yeater is bidding?