Here's a good video showing famous stars with and without their makeup. Celebrities shown here include Lindsay Lohan, Britney Spears, Cameron Diaz, Eva Longoria, Lennifer Lopez, Madonna, Kate Moss, Pamela Anderson, Jessica Simpson, Tyra Banks, Paris Hilton, Catherine Zeta Jones and Victoria Beckham.

Update June 2009: The video below is no longer available but check out this other good one about celebrities before and after makeup.