JANUARY JONES, 35
For Jones, it all comes down to the hair. "If put into a set of rollers, [it] just bounces into the Betty [Draper] look," the Mad Men star explained to Allure. Though she's admitted her hair has started to fall out a bit because of damage, she'll work her hardest to keep it blonde. "My son recognizes me in photos when I am blonde," she said. "He says 'mama.'"