Well, i don't think Jude's cheating was based on how beautiful he thought his nanny was! A lot of time celebrities cheat with people in their inner circle because they have developed some sort of friendship or small trust, and possibly with the hopes that these people will be more confidential. In Jude's case, I think he was lonely and it became a matter of comfort level and convience. Trust me, if Jude wanted beauty he could have gotten it without a problem!