She starred in romantic comedies Pillow Talk, Midnight Lace and Love Me or Leave Me, acting alongside leading men including Clark Gable, Cary Grant and Rock Hudson.
Her hit songs included Whatever Will Be Will Be (Que Sera), from Alfred Hitchcock's The Man Who Knew Too Much, in which she appeared with James Stewart.
Her squeaky-clean image was referenced in the 1971 musical and 1978 movie Grease, in the song Look At Me, I'm Sandra Dee.
Paul remembers Doris Day: 'So sad to hear of Doris Day passing away. She was a true star in more ways than one. I had...
Posted by Paul McCartney on Monday, 13 May 2019
With her cheerful, alliterative stage name, the smiley blonde occupied a parallel world to her contemporary Marilyn Monroe. The running joke, attributed to both Groucho Marx and actor-composer Oscar Levant, was that they had known Day "before she was a virgin".
Her 1976 tell-all book, Doris Day: Her Own Story, chronicled her money troubles and three failed marriages, contrasting with the happy-go-lucky image of her Hollywood career.
"I have the unfortunate reputation of being Miss Goody Two-Shoes, America's Virgin, and all that, so I'm afraid it's going to shock some people for me to say this, but I staunchly believe no two people should get married until they have lived together," she wrote.
In more recent years, Day turned her attention to animal welfare, founding the Doris Day Animal Foundation in 1978.