If Ashton cheated on Demi, he wouldn't be the first Hollywood hotshot to leave very green grass for even lusher pastures.








From nanny-bangers to serial cheaters, the biggest problem with these playboys is that they got busted...

8. Tiger Woods
The golfing legend boinked so many women behind wife Elin Nordegren's back, we wonder how he had time to scratch himself. Guess he just had to roll over and ask whoever was lying there to do it for him... 

6. Hugh Grant
Liz Hurley had no choice but to dump Hugh's arse when he was busted by the cops with prostitute Divine Brown. Shame she's now hooked up with another cheater on this list...

Check out the 10 biggest celebrity cheaters here!