Days after her 51st birthday, pop’s reigning queen reflects on three decades of provocation, scandal and monster hits. by Austin Scaggs Outside Madonna’s London home, which sits on a quaint street in the Marylebone neighborhood, hangs a sign that reads Someone famous may have thought once about living here. Today, that someone is on break from the last leg of her Sticky & Sweet Tour, and the house is buzzing with activity. In the basement, film editors are piecing together two new music videos. In the dimly lit foyer, with deep-blue walls and an old-master painting of a carnival in Venice, other staff mill about: an assistant, a construction worker, a maid and Madonna’s trainer, who is irritated about an unbecoming tabloid photo showing Madonna with sinewy arms. “I get hundreds of e-mails from people around the world who want that body,” the trainer complains. But in Madonna’s world, after 27 years of scandal and provocation, one unflattering pic is barely a blip on the radar...