Celebrities have a habit of letting their fame go straight to their head, thinking their status makes them untouchable, so they lie, cheat and steal even though they know their life is constantly being analyzed by the press.
Sometimes the lie just proves how hungry the actor is for a role, as was the case when Mila Kunis claimed she was turning 18 so she could be on That '70s Show when she was actually only fourteen-years-old.
Others tell huge lies because they're starving for attention, like pretty much any member of the half-baked Kardashian clan:
One of the weirdest lies told in recent history was told by Jack and Meg White of the White Stripes- they claimed they were brother and sister when they were actually a married couple. Jack is one of the most talented guitar players out there, so why rely on a gimmick to sell your band?