We know all the professionals say you shouldn't wash your hair everyday, and truthfully, we're usually able to get at least a day in between shampoos. However, if we have to be out in public, we really can't push it too much longer than that without limp, greasy locks -- Jessica Simpson, however, goes considerably longer between washings.

Heeding the advice of her friend and hairstylist, Ken Paves, Jessica only washes her hair two or three times a month. She could've fooled us -- we haven't noticed her hair looking dirty or oily. According to Star magazing, though, she does have to spritz it with perfume on occasion to keep it from getting smelly.

Maybe she's just really adept at hiding it with hats, headbands, and extensions from her Hairdo line, or maybe your hair really does adjust to not being washed as often.