We've seen Sienna Miller [1] test-drive a bevy of hair colors (including her most recent rose gold moment [2]), but she recently stepped out with a hue we can't remember ever seeing on her before. Sienna hit the beach with fiancé Tom Sturridge and daughter Marlowe [3] with some red hair that almost distracted us from her smoking bikini body. We haven't heard of Sienna being attached to any movie projects right now that call for a redhead, so maybe she just wanted to try it out. How do you think the color works for her?
See more exclusive photos of Sienna's beach vacation on POPSUGAR [4]!