Director and producer, Alfred Hitchcock, liked to cast blonde actresses in leading roles in his films. Hitchcock's blonde leading ladies often had the lightest of blonde hair; hair so white blonde that it was seemingly stripped of all natural color. As Hitchcock movies were suspenseful psychological thrillers that included frightening scenes, an alternate definition of "Hitchcock Blonde" refers to a scary, unnatural shade of blonde hair.
Some of Hitchcock's more famous blonde leading ladies were: Tippi Hedren (Marnie, The Birds), Grace Kelly (To Catch a Thief, Rear Window, Dial M for Murder), Kim Novak (Vertigo), Doris Day (The Man Who Knew Too Much), Eva Marie Saint (North By Northwest), Marlene Dietrich (Stage Fright), Carole Lombard (Mr & Mrs Smith), Joan Fontaine (Rebecca, Suspicion), Julie Andrews (Torn Curtain), and Ingrid Bergman (Spellbound, Notorious).
Marilyn Monroe had Hitchcock blonde hair that was bleached whiter than her teeth.