Think you know your favorite stars?  Think again!  These celebs have some pretty strange habits.

Jessica Simpson

shutterstock_15896059John Steel /

Jessica Simpson doesn’t smoke, but that didn’t stop her from developing an addiction to Nicotine gum.  The country star reportedly got hooked on the stuff that’s typically used to help people kick a smoking habit.  Unfortunately, we don’t know how the star picked up this strange habit in the first place. Click "Next" to see more.