Sir Paul McCartney stepped out with new girlfriend Nancy Shevell in London for the first time on Tuesday to attend a charity event.The former Beatle, who has been dating the American heiress since last year, introduced Shevell to his family at the British Style Observed exhibition in the British capital.The pair, who enjoyed a budget tour of the U.S. this summer, perused the photographic works up for auction to raise funds for cancer sufferers, including snaps taken by McCartney's photographer daughter Mary.McCartney is reportedly hunting for an apartment in New York in order to be closer to Shevell, who lives in the Big Apple.

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