Penning a memoir at age 26 takes cojones. Winning a British Book Award for it takes the world's most famous left foot, a former Spice Girl wife and a public adoring enough to make it the nation's fastest-selling biography of all time. Published last fall, soccer star DAVID BECKHAM'S My Side has sold more than 1 million copies, earning it a special prize for popular success at the awards last week. Beckham couldn't quite savor the victory, however, as he was also getting kicked around by the British press for an alleged affair with his assistant, which he denies. But hey, that's all the more fodder for My Other Side: The Late 20s.