The natural blonde Mad Men star, who became a red head for her new movie Sweetwater, has put her luscious locks through the ringer in recent months by trying everything from pink tips to darker 'dos - and Jones admits the drastic changes have taken a toll on her tresses.
She tells British magazine Grazia Daily, ""I have been every colour and now my hair is falling out in clumps. I've been blonde, red with extensions for this film, then blonde, then black, and now blonde again. I'm going to have to shave it off and wear a wig (so it will grow back healthy).""
However the actress admits it's fun to see how people react to her whenever she tries a different look: ""I didn't get treated differently when I was red-headed, but when I went dark for a few months, I was suddenly invisible. Not just as a celebrity, but to my friends and family. I was like, 'Come on you guys, it's me!'""
But one thing's for sure her baby son Xander has a favourite look for his mum: ""I like it all colors, it makes you feel different according to what colour it is, but I prefer to be blonde. My son recognises me in photos when I am blonde. He says, 'Mama.'""