Sheryl Crow performs at "We Are One: The Obama Inaugural Celebration At The Lincoln Memorial" January 18, 2009 in Washington, DC.
Mark Wilson,Getty Images
Madonna seen leaving her gym wearing a Barack Obama t-shirt after a workout in London, England. January 2008
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Newlyweds Beyoncé Knowles and Jay-Z take a stroll in New York. Beyoncé is wearing a Barack Obama t-shirt designed by Shepherd Fairey.
Frank Grimes, Splash News
Alicia Keys performs at the Black Ball UK in aid of 'Keep A Child Alive' HIV/AIDS charity at St John's, Smith Square on July 10, 2008 in London, England.
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Fergie lets everyone know she is backing Barack Obama for president while rocking the house in Puyallup, Washington, by wearing an Barack Obama Smith T-shirt during her concert. September 2008
D. Shook, Splash News
Aubrey O'Day: Bowlmor Lanes 70th Anniversary Party Hosted by Michael Phelps in NYC. 10/07/2008
Demis Maryannakis, Splash News
Michael Stipe: R.E.M. performs onstage during day 3 of the 6th Annual Langerado Music Festival at Big Cypress Seminole Reservation on March 8, 2008 in the Everglades, Florida.
Jeff Kravitz/FilmMagic, Getty
Eve attends the "Respect My Vote!" Get Out the Vote bus tour at the Wachovia Center on October 24, 2008 in Philadelphia, Pennsylvania.
Mychal Watts, Getty Images
Sean "Diddy" Combs arrives at Dream Bigger Studios to record a message for President-Elect Barack Obama in Los Angeles, Calif.
Star Pix / Miguel Aguilar / INFphoto.com
Jared Leto and his band 30 Seconds to Mars pose in Barack Obama t-shirts as they arrive for the 2008 MTV Europe Music Awards on November 6, 2008 in Liverpool, England.
Kevin Mazur/WireImage, Getty Images