Credit: ABC

Miranda's red locks are gone, gone, gone!

Cynthia Nixon debuted a bald, shaved head Tuesday during an appearance on Live! With Kelly.

The Sex and the City star's striking new look wasn't an arbitrary style decision. The actress, 45, subjected herself to the extreme buzzcut for her upcoming starring stage role it Wit -- the award-winning drama about a poetry professor, named Vivian Bearing, who battles cancer. Nixon herself battled breast cancer in 2006, and now serves as an ambassador or Susan G. Komen for the Cure.

The Pulitzer-prize winning play debuted off-Broadway in 1998; Emma Thompson played the lead role in a 2001 HBO film adaptation.

Wit's official Broadway premiere is this Thursday at the Samuel J. Friedman Theatre.

Nixon and and partner Christine Marinoni welcomed son Max in February of last year.