Updated

A red vinyl dress worn by pop singer Gwen Stefani (search) of No Doubt for the band's first hit album has been stolen from a museum.

The dress, which was on a mannequin behind a plastic glass wall, disappeared Tuesday afternoon from an exhibit dedicated to the history of rock music in Orange County.

Stefani, 35, who attended high school and college in the county, wore the sleeveless dress with matching red boots for the cover of the 1995 album, "Tragic Kingdom," which included the hits "Don't Speak" and "Just a Girl" and sold about 15 million copies worldwide.

The exhibit curator, Jim Washburn, said the dress could be worth up to $5,000.

A police investigation is focusing on two young women seen near the exhibit at the Fullerton Museum Center (search) with backpacks around the time of the theft. Police have made no arrests.

Stefani's record company, Interscope, said the dress could be returned with no questions asked at a drop box at the museum or at the office of Rebel Waltz Inc., the Laguna Beach company that manages No Doubt (search).