Rapper Lady Sovereign has blasted British singer Joss Stone for her "diva-like" manner. The London MC, who will be supporting Gwen Stefani on her UK tour, branded Stone an "asshole" for speaking with an American accent. She says, "All that s**t with her accent. She is a bit stupid walking around like some American diva. She is an asshole. "I couldn't believe her at the Brits. I nearly threw a slipper at my TV. What a ponce."