Trying to keep a secret is difficult -- and its even tougher when you're always in the limelight.
Unfortunately, for these celebs their cheating ways got exposed when they were caught in the act by the paparazzi.
From the infamous Tiger Woods to Ashton Kutcher, Kristen Stewart and even Kris Jenner, this list has it all.
Browse through the gallery and read up on which celebs dirty deeds got exposed. Images and captions via Izismile.