<p>WHILE men the world over drooled over the latest cover of Esquire, which featured Britney Spears mimicking a famed 1966 Angie Dickinson photo, Spears herself was livid. Sources say the singer - who appears in less and less clothing with each successive magazine cover - was "humiliated" by her bottom-baring pose, which had her standing sideways in a skin-tight sweater and white stilettos. The photo was shot by James White for Esquire's "70 Years of Women We Love" issue. "Britney thinks the pictures are too naked and is really angry at Esquire," a magazine insider said. "But really, is she out of her mind? I mean, her brother was at the shoot. Exploited? Is she crazy? Look at the photos she has done for everyone else. The Rolling Stone cover was practically naked, too - but she wasn't exploited by them?" Relations between Esquire and Spears have been frosty ever since editor David Granger thought he had an exclusive on the pop tart - and then she posed for other magazines without telling him. A rep for Spears declined comment.</p>