It is an undeniable known fact that there are some people who have the difficulty of staying committed to just one person during their relationship. Infidelity is a crime and celebrities are the often victims as they find themselves being separated for a long time from their significant other due to their very hectic and demanding work schedules.

Recently, "Twilight" actress Kristen Stewart released a public apology about her cheating on boyfriend Robert Pattinson with "Snow White and The Huntsman" director Rupert Sanders. Her apology confirms the rumors that she really did in fact cheat on her boyfriend with a man who is twice her age and is already married.

"I'm deeply sorry for the hurt and embarrassment I've caused to those close to me and everyone this has affected. This momentary indiscretion has jeopardized the most important thing in my life, the person I love and respect the most, Rob. I love him, I love him, I'm so sorry," Stewart told People magazine.

It appears that the 22-year old actress was forced to make a public apology after pictures of her and Rupert Sanders were released.

"It seemed like they couldn't get enough," the photographer that sold the pictures revealed. Even though Kristen Stewart is not the only person who cheated or came clean with the wrong-doing, still, it cannot be helped but to ask the question: "Why?"

Take a look at the photos of these other celebrities who could not stay committed to just one person.

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