Fearne Cotton has gone from blonde to platinum since the birth of her son Rex. The Saturdays Frankie Sandford has transformed her hair from short to long since she's been pregnant, Sarah Harding also added some serious length to her blonde hair, Rihanna has lightened her naturally dark hair from a red hue to bright blonde and now Alexa Chung has gone from deep brown to medium brown with blonde highlights. Perhaps Riri, Sarah and Alexa have some baby news that inspired these colour chameleons? Hmph. . . In any event, take a look at their hair changes and vote on which look you like best!