Want to meet Justin Bieber?

The 17-year-old singer is just one of a handful of celebs participating in The Green Auction: Bid to Save the Earth.

One of the hot items up for grabs: round-trip tickets to Tokyo to attend and meet him at his May 19 concert!

Check out CharityBuzz.com for more details. Bidding is open through April 7.

And it’s all for a good cause – proceeds from the auction will help raise funds to benefit four leading environmental nonprofit organizations!