Britney Spears' Mickey Mouse Club T-Shirt she owned is up for auction. A memorabilia site would be auctioning a piece of the pop princess' Mouseketeer past starting on July 21.

GottaHaveIt.com will be having a special online auction entitled "The Rock & Roll Pop Art Auction" from July 21 to August 6, which will feature original handwritten lyrics and letters and other rare items by the music industry's greatest living and dead legends.

The t-shirt that Spears gave to one of her grandmothers is expected to reach as much as $20,000 not only because it has the singer's handwritten "I love you grandma" on it, but also because it was signed by fellow Mouseketeers including Justin Timberlake, Christina Aguilera, and Keri Russell.

The highlight of the auction is Elvis Presley's white jumpsuit with blue peacock prints he wore on stage in 1974.

Other items on the auction include memorabilia from Marilyn Monroe, Madonna, Paul McCartney, John Lennon, George Harrison, and Johnny Cash among others.

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