But it's potentially the most valuable: Artists Frank Stella, Shepard Fairey and Andrew Serrano each added their touch to the work in December.
It will be sold March 8 by auction house Phillips de Pury & Company, with proceeds going to DonorsChoose.org.
Another Colbert portrait was hung in Washington's National Portrait Gallery in 2008. Despite his conservative pundit's disregard for high culture, Colbert has increasingly embraced the art world. He recently claimed to be the elusive graffiti artist Banksy.