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

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Knowles put a sexy twist on the tuxedo while introducing her new single, "Run the World (Girls)," on the United Center stage. "Because of you, women everywhere have graduated to a new level of understanding of who we are, of what we are and most of all, who we can be," the singer says.