Beyonce Surprises Oprah at 'Farewell Spectacular'

Beyonce performs her hit single, “Run the World (Girls),” on Tuesday (May 17) at the United Center in Chicago, Ill.

The 29-year-old entertainer got the crowd dancing while taping an appearance on Surprise Oprah! A Farewell Spectacular, which will air May 23 and 24.

Also coming out to support Oprah as she wrapped up 25 seasons of The Oprah Winfrey Show: Tom Cruise and wife Katie Holmes (who introduced country group Rascal Flatts), Madonna, Halle Berry, Tom Hanks, Dakota Fanning, Queen Latifah, Will Smith, Jada Pinkett Smith, Jerry Seinfeld, Jamie Foxx, Stevie Wonder, Aretha Franklin, and Kristin Chenoweth!

John Legend spoke live from New Orleans and announced 25 new school libraries will be built around the country by Target in honor of Oprah, while Diane Sawyer revealed 25,000 trees will be planted in her honor as well.

Also attending the star-studded event: Maria Shriver – whose husband, Arnold Schwarzenegger, earlier in the day admitted he fathered a child with a former member of their household staff – and Oprah‘s longtime partner, Stedman Graham, who brought O to tears!

Bigger pic inside…