Britney Spears’s guest appearance on How I Met Your Mother could benefit her career and…the environment.

According to the Associated Press, at least six items of clothing from the pop star’s wardrobe on the show will be auctioned off to benefit the Natural Resources Defense Council.

The auction will begin Monday, right after the episode starring Spears airs on CBS.

Producers of the show sponsored the sale, which will include a navy print Juicy Couture dress, a yellow Nannette Lepore dress and a cream Nannette Lepore cardigan with blue flower details, all worn by Spears during filming.

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