Joss Stone has prompted reports of a romance with British heir Prince William after claims the royal regularly calls the singer to discuss her performance at the forthcoming Diana, Princess of Wales concert. Stone is among a number of acts due to perform at the London gig on 1 July (07) , to mark what would have been the Princess's 46th birthday - including Sir Elton John and Duran Duran - but friends claim single Stone, 20, has been getting special treatment from the 24-year-old prince, who recently split from longterm love Kate Middleton. A friend tells British newspaper the Daily Mirror, "She thinks he's gorgeous and is incredibly flattered." A source adds, "Joss is delighted by the fact that William is phoning her and they hit it off instantly. They've spent ages talking about which songs she should perform." Stone recently complained about her love life - she has been single since splitting with Beau Dozier two years ago - moaning, "I think I'll have to turn lesbian. Every girl my age wants to be in a relationship."