Veteran singer/songwriter Billy Joel has poured doubt on his former wife Christie Brinkley's rumoured relationship with Sir Paul McCartney, insisting they're all "old friends". Former supermodel Brinkley and MCCartney were spotted socialising at the Hamptons in New York state over the weekend (11/12Aug07), leading to speculation the single stars are dating. But Joel believes it's more likely the pair were just hanging out as friends. He says, "I know Paul from a long time ago... many, many years ago. We knew Linda and Paul and their kids. So, he's actually an old friend. "I think she (Christie) knows him from the same way I know him. They're just old friends."