London: Teen superstar Justin Bieber has reportedly shown off his charitable side by auctioning off his customized motorcycle for charity.

The 17-year-old pop sensation is offering up his purple two-seat, three-wheeled Campagna T-Rex, which features his initials JB painted on the hood, Daily Star reported.

Proceeds will benefit professional skateboarder Rob Dyrdek's foundation that aims to develop and construct legal skate parks.

The motorcycle is estimated to fetch 31,000 pounds when the Charity Buzz auction wraps up later this month.

(Agencies)