The students at the leadership academy serenade Oprah.

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It was a weekend of celebration before the official opening of The Oprah Winfrey Leadership Academy. Oprah and 200 friends bid adieu to 2006 with a New Year's Eve celebration organized by master party planner Colin Cowie. As the evening continued, one guest after another took to the stage for impromptu performances—Mary J. Blige, Babyface, Patti LaBelle, India Arie and Tina Turner!

Before returning back home to Chicago, Oprah stopped by the academy one more time for "a conversation with all of the girls about giving their personal best," Oprah says.

Following Oprah to her car, the girls had a surprise ready…they all serenaded Oprah. "I'll do my best. I'll do my best, ma'am. I'll do my best for you. My very, very best," they sang.

Tune in to ABC on February 26 for a special primetime documentary on The Oprah Winfrey Leadership Academy for Girls–South Africa. Check your local listings.