Spears' Signed T-Shirt Is Top Auction Item

A Mickey Mouse Club T-shirt Britney Spears signed 'I love you grandma' on is set to fetch up to $20,000 at auction. Spears owned the shirt during her stint as a star of the kids show and gave it to one of her grandmothers as a gift. The clothing item will now be a highlight of the upcoming GottaHaveIt.com Rock & Roll Pop Art Auction, which starts on July 21. The shirt is also signed by Spears' former Mickey Mouse Club castmates, including Justin Timberlake and Christina Aguilera .