In the life of a celebrity, it’s pretty hard to walk down the street without being mobbed by fans, asking for an autograph or a cheesy selfie. You would think that celebs would have enough of the camera in their down time, but it turns out that they just can’t help themselves from popping into shot, even when they haven’t been asked!For these innocent photographers, they had no idea they were coming away with a celebrity snap.Take a look at this gallery of the best celebrity photobombs of all time.