Christina and Kimya join the long list of contributors including Drew Barrymore, Norah Jones, Feist, the cast of Parks and Recreation, Rodarte, author Neil Gaiman, Grizzly Bear, No Doubt, Red Hot Chili Peppers, Natalie Portman, Kate Nash, Tegan and Sara, Spike Jonze, Daft Punk and Vampire Weekend.

Up for bidding from Christina Aguilera is a used-by-her, autographed wireless Shure SM86 microphone. Kimya has donated two tote bags she hand decorated.

The auction began Monday and continues through Saturday March 27.

Other items up for grab include Kings of Leon limited edition silk screens, a Drew Barrymore decorated camera,T-shirts decorated by Feist, Norah Jones, Shirley Manson (Garbage), The Black Keys, Rodarte and others, wallets decorated by The Strokes and Sia and various other crafted bags and clothing. Also included are signed guitars, movie and television memorabilia, original artwork and much more.

You can bid here.