Estranged couple Sir Paul McCartney and Heather Mills are holidaying together in the US, with their three-year-old daughter BEATRICE, according to reports. Despite their bitter divorce battle, the trio are spending time at MCCartney's home in the Hamptons on New York's Long Island. Mills and the former Beatle have been spotted working out at different gyms in the towns of East Hampton and Amagansett, after arriving at the popular summer retreat last week (ends3Aug07). A source tells the New York Daily News, "It won't be a conventional family holiday - there's still tension."