Quite a few models and celebs have made pretty drastic hair color changes recently. Crystal Renn shocked everyone with her new stark white hair and brows, and a slew of actresses--like Jennifer Connelly and Olivia Wilde (a face of Revlon)--just went blonde. Changing your hair color is an easy way to try on a new identity for a little while.
Faux hair color can even become a signature, as blonde bombshell Marilyn Monroe (formerly mousy girl-next-door Norma Jean) proved. Into the Gloss just profiled fashion DJ Leigh Lezark, who's known for her sleek raven-colored 'do; it turns out she naturally has blonde curly hair. And that Germanic warrior Heidi Klum? She's naturally a brunette. Whether it's for a role or something more profound--like a break-up or major life event--these models and celebs opted for a new persona, at least temporarily. Click through to check out the most recent tress transformations we've spotted, plus some classic hair turn-arounds that left us asking "Who's that girl?"