Joss Stone is denying a report that she's on her way to becoming buddies with Prince William.

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On Saturday, the U.K.'s Daily Mirror reported that William, who turns 25 on Thursday, has been calling Stone, 20, about the upcoming concert for Diana and that the two were becoming great pals.

But a rep rubbishes such claims by the media and simply said that Stone says she and the prince are not getting close. "They talked about what songs she is going to sing at the concert and that gets translated into a story about how William has been bombarding her with calls," says her rep, Dave Woolf.

According to Woolf, Stone will sing her song "You Had Me" as well as a cover of Queen's "Under Pressure" and a Tina Turner number that the prince's late mother particularly liked. "Princess Diana was always a fan of Tina Turner," says Woolf.

Stone was only 10 when Diana died and she learned of the princess's tastes from William, Woolf says: "She is really pleased to be involved in the event and was anxious that she do something that would have meant something to the princess as opposed to singing any old three songs. She wanted to get direct input about what they wanted her to do."

The princes have been taking a big role in organizing the concert. "They have had a great time, almost taking the role of promoters," says a palace source. Both William and Harry have had conversations with some of the acts taking part wherever "they thought it was right to do so," the source adds. Some royal friendship brewing there, eh?!