Brit's wardrobe is being auctioned for a good cause!

Like BRITNEY SPEARS' floral dresses from her recent "How I Met Your Mother" appearance? You can win them by bidding online here at SeenOn.com. 

Items up for bid were all worn by the "Gimme More" singer during her turn as receptionist Abby. They include a red and white, sleeveless sundress with ribbon belt, a green and yellow lace sundress, and a beaded cream cardigan with plastic flowers by designer NANETTE LEPORE plus items from JUICY COUTURE and MARC JACOBS. But move fast, because several of the items are already past the $1,000 mark!

The pop star is doing her part for the environment. The proceeds will benefit the Natural Resources Defense Council.