January Jones is a redhead! The Mad Men actress traded in her signature blond bob for cinnamon strands with matching extensions. Jones has been known to experiment with her color—she added "rose gold" streaks to her platinum curls earlier this year—but this is the first time we've seen her go for a complete hair makeover. No word yet on whether or not the look is for an upcoming movie role, but we sure are curious to find out!
Click through the gallery to see more celebrity hair makeovers.