So we were a bit surprised to see her show up in a completely different sort of look at last night's No Strings Attached screening in New York. Sure the age-defying bod was still there, but instead of a sexy, figure-hugging frock, Demi went for a floaty turquoise and black dip-dyed dress with a sheer black chiffon top.
It looked fresh, feminine and almost dainty - and it's definitely a surprising fashion choice coming from the normally predictable dresser.
Do you prefer Demi's usual uniform of fitted mini-dress, or this new, more relaxed look? Leave a comment and let us know.