Stars React to Amy Winehouse's Passing

The music world mourns the loss of another great, Amy Winehouse. The British singer was found dead on Saturday in her London home. She was 27.

Almost instantly, as news spread across the globe, stars took to their Twitter accounts to express condolences.

Read Twitter reactions from Usher, Keri Hilson, Missy Elliot, fellow British singer Estelle and more...