Celebrating Oprah

Oprah Winfrey's Star-Studded Farewell Taping

See the A-listers – Halle Berry! Maria Shriver! Madonna! – who bid adieu to the talk-show queen at Chicago's United Center

USHER

What a kiss-up! After serenading Oprah with "Oh Happy Day," Usher gives the talk-show queen a sweet smooch while taking the stage with Simon Cowell, Will Smith, Michael Jordan, Cruise and O'Donnell.