Britney Spears has been accused of stealing four white coats from designer Katja Berglund following her 26th birthday celebrations in Los Angeles at the weekend.The pop star partied at the Scandinavian Style Mansion on Saturday night with old pal Paris Hilton - but is alleged to have picked up a few extra coats, costing a total of $28,200 (€31,800), for her and her friends as she left the venue, according to Swedish newspaper 'Aftonbladet'.