Of course not. Cheating has more to do with a lack of honesty and integrity than it does with fame or wealth.
Having said that if one has (decided to cheat) then the more fame, money, and power they have the more "options" they are likely to have.
Famous people don't have to go through the exercise of trying to (hide their marital status) from the "other woman" or "other man". Their sex partners know what they are dealing with from the outset and (don't care). Some people would love to sleep with anyone "famous" married or not just to be able to say they had the experience.