Estelle made a successful U.S. debut — and won a Grammy for it — when she wrote an ode to more than one "American Boy." The lady from London spanned the States as she celebrates guys from Cali, New York and Miami, but Estelle forgot to slip in a note about fellas from the Midwest. She made up for it, however, by making room for 16 bars by Chicago's own Kanye West. "Kanye basically just brought his own cheeky self to the track, his own sense of humor," Estelle said of West's contribution. "At first he was like, 'How can you rap over a dance beat?' — and now he's done it!"