Chelsea Lauren/WireImage, Bobby Bank/WireImage

Rachel McAdams was spotted last week sporting a cute, conservative coif on the set of her new film, "Morning Glory," then in a tousled bob just a few days later at Comic-Con 2009.

Whether she cut her signature curls, or simply removed a set of extensions, I think Rachel should continue to switch between the two styles. They're youthful, flattering, and each showcase a different facet of her beauty.