Actually it was both! In her younger years Katharine did have red hair, but as she emerged in the film industry she died it brown. (look on imdb trivia)
Did Audrey Hepburn Have Red Hair?
Nope she was a brunette
Oh yes! Audrey Hepburn had flaming red hair. In fact she became popular for her beauty and red hair in America when she started her carrier.
Are you kidding?!?! Audrey was known at the time for being different than the other busty, blonde, diva-like bombshells like Marilyn Monroe. She was elegant, classy, graceful, beautiful and BRUNETTE!