6. Arnold Schwarzenegger  

Arnold Schwarzenegger sullied his family man persona when news leaked that the Governator had fathered a love child with his family's housekeeper, Mildred Patricia Baena. The long-term affair is said to have taken place while he was married to Maria Shriver. {relatedarticles}It doesn't end there: Rumor has it the former governor also carried on numerous other extramarital dalliances throughout their relationship. For instance, the actor's 2012 memoir reveals that he stepped out with co-star Brigitte Nielsen in the mid-'80s while he was dating Shriver. Seems that just like the Terminator, old habits always come back.