The news comes following a statement released online by The Doris Day Animal Foundation, announcing that the star had been 'in excellent physical health for her age, until recently contracting a serious case of pneumonia'.
The fatalistic song Que Sera, Sera (Whatever Will Be, Will Be), which she recorded for the 1956 Alfred Hitchcock thriller The Man Who Knew Too Much, became... Growing up she gravitated towards singing and had her first hit "Sentimental Journey", in 1945, which was co-written by Les Brown and recorded with his band.
The statement added: "She was surrounded by a few close friends as she passed".
She and Hudson made some of the most popular - and profitable - movies of the early 1960s, including "Lover Come Back", "Move Over Darling" and "Send Me No Flowers". For generations of Americans, though, Doris Day was more than just a retired actress.
Her screen partnership with Rock Hudson was one of the biggest box-office draws of the 1950s and '60s. Though she never won an Oscar - an ongoing source of outrage among her fans - she was awarded the Presidential Medal of Freedom in 2004 and a Lifetime Achievement Grammy in 2008.
Day was married four times, first to trombonist Al Jorden, then saxophonist George William Wiedler, film producer Martin Melcher, and restauranteur Barry Comden.
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Doris was also a singer and performed the hit song "Que Sera, Sera", and she was a famed animal rights activist.
Doris Day, a legendary actress whose irrepressible charm and all-American looks enshrined her in Hollywood history, has died aged 97, her foundation confirmed this afternoon.
She received two stars on the Hollywood Walk of Fame, one for her film work and one for her music work. "Doris' wishes were that she have no funeral or memorial service and no grave marker". A bandleader changed her name to Day after the song "Day after Day" to fit it on a marquee.
Day began singing at a Cincinnati radio station, then a nightclub, then in NY.
The Doris Day Show: According to Justwatch.com, this sitcom originally broadcast on the CBS network from September 1968 until March 1973.
"She was a wonderful friend to us and a lovely and very talented lady", singer Tony Bennett said on Twitter. She had her only child with him, a son named Terry.