Heidi Klum is selling her clothes for charity.

The German supermodel has donated several of the coveted pieces she wore to Mercedes Benz Fashion Week to the latest Fashion Project sale at massively discounted prices.

Heidi's charity sale will benefit amfAR, an organization that works on behalf of global HIV/AIDS patients.

Fans of the statuesque blonde can get their hands on the shimmery bronze Max Azria gown which she wore for the 'Project Runway' finale, for just $599.

The hippie-style vest she donned to sit front row at the BCBG by Max Azria show is also up for sale for $299.

Fashion Project, set up by two Harvard classmates, allows people to sell their items online and choose which charity the profits go to, as well giving customers the possibility to snap up designer clothing for a good cause.

Other items in Heidi's amfAR sale include a Kate Spade New York dress and a Stella McCartney shoulder bag, which were donated by some of the model's famous friends.

The star is famed for her daring dress sense and refuses to change her style now she's turned 40, jokingly disguising herself as a wrinkly old lady for her 14th annual Halloween party.

She told People magazine: ''There was so much talk about me turning 40 this year and what it felt like to be older. I thought, really? I will show you old!''