One Direction star Liam Payne is celebrating his birthday by urging fans to give cash to charity.

The singer, who turns 20 on Thursday (29Aug13), has joined bandmate Harry Styles to team up with celebrity charity website Prizeo to raise money for Trekstock's cancer fund.

The pair will whisk one lucky donor for an evening out in central London, and the winner will also receive $750 (£500) in vouchers to spend on a shopping spree. All those who donate to the cause will be entered in the prize draw.

Payne took to on Thursday to inform his followers of the project, writing, "Can't quite believe my life... there's no bigger birthday present than what you've done for me in 3 years... thank you... If anyone was planning on buying me anything this is the 1st place u should go (Trekstock), you could make (a) difference to somebody."