LOS ANGELES (March 22) - It seems almost everybody wants a piece of Britney Spears, and at least six pieces are officially for sale.

Spears' wardrobe from her guest-starring stint on CBS' "How I Met Your Mother" will be sold at an online auction to benefit the Natural Resources Defense Council, an environmental organization.

The weeklong auction begins Monday night, just after the episode featuring the pop star is set to air. Spears plays a flirty receptionist who falls for show's main character.

A half-dozen Spears-worn items will be available, including a navy print Juicy Couture dress, a yellow Nannette Lepore dress and a cream Nannette Lepore cardigan with blue flower details.

CBS and 20th Century Fox Television, which produces the show, are sponsoring the auction.