Pop princess Britney Spears is cleaning out her closet, and she’s got a special message for the new American idol.

Pop idol Britney Spears is singing the praises of "American Idol" Ruben Studdard. “Congratulations, man. Just keep doin' what you do. Just sing from your heart.”

Meanwhile, fans can get a piece of the pop princess. Your favorite former Mouseketeer's most intimate memorabilia is now just a mouse click away.

Britney is in New York styling her new dirty-blonde, bobbed look to promote her first ever online auction. The auction is benefiting her children's charity and performing arts camp.

More than 160 bonafide Britney items are available. including the jaw-dropping outfit she wore at the 2001 Video Music Awards, the sleeve-less one-piece she sported at the 2000 Grammy’s, and the “Slave For U” outfit.

Britney tells “Extra,” “My mom wants me to get rid of all the major costumes, cause she doesn't want me walking around in that.”

Britney’s cleaning house for a good cause. It’s all up for auction at gottahaveit.com.