Doris Day, the Hollywood icon best known for her work in the Fifties and Sixties, has died. She was 97 years old.

The Doris Day Animal Foundation said that the actor, singer and activist died earlier this morning at her Carmel Valley, California, home.

The foundation said that she was surrounded by close friends and “had been in excellent physical health for her age, until recently contracting a serious case of pneumonia”.

Day was once one of the biggest female stars in the world, appearing in classic films as Calamity Jane, Pillow Talk and Love Me or Leave Me.

The song “Que Sera Sera”, first performed by Day in Alfred Hitchcock’s The Man Who Knew Too Much, won the 1956 Oscar for Best Original Song and later became the theme to Day’s sitcom The Doris Day Show.

Day was later nominated for Best Supporting Actress at the 1960 Academy Awards for her performance in Pillow Talk alongside Rock Hudson, who she later collaborated with on Lover Come Back and Send Me No Flowers.

Doris Day's best films Show all 10 1 /10 Doris Day's best films Doris Day's best films Pillow Talk (1959) In what is considered her finest romantic comedy, Day stars alongside Rock Hudson as an interior decorator who falls for a Broadway composer Rex Doris Day's best films Young At Heart (1955) Day appeared alongside Frank Sinatra in this musical drama about a complicated love affair Rex Features Doris Day's best films The Pajama Game (1957) Day plays a union member who falls for someone in upper management. The only problem is that the union is fighting management for a payrise... Warner Bros. Doris Day's best films It Happened To Jane (1959) This 1959 classic rom com saw Day employing the legal aid of acting legend Jack Lemmon when a shipment of lobsters goes wrong Columbia Pictures Doris Day's best films That Touch Of Mink (1962) Day stars as a young woman in New York City who is subject to the advances of Cary Grant's wealthy businessman character Rex Features Doris Day's best films Calamity Jane (1953) In one of the greatest musicals of all time, Day plays a fictionalised version of the American frontierwoman Calamity Jane from Deadwood, Dakota. Alamy Doris Day's best films Lover Come Back (1961) In her second comedy starring alongside Rock Hudson, Day plays an advertising agent who is competing to win a contract Universal Pictures Doris Day's best films Caprice (1967) Day plays an industry spy who falls for a man from the other side Rex Doris Day's best films Love Me Or Leave Me (1955) A biopic of Ruth Etting a singer from Chicago who became a film star Rex Features Doris Day's best films The Man Who Knew Too Much (1956) In a turn, Day starred in Alfred Hitchcock's celebrated ensemble thriller Rex

Actors from around the world paid tribute to Day, including Luke Evans, who wrote on Twitter: “Goodbye Doris Day, there was only one of you! I have always loved your voice and the beautiful songs you made eternal.”

Fashion designer Stella McCartney wrote: “The one, the only, the woman who inspired so much of what I do... Doris Day I love you, my calamity Jane. An iconic woman who I was hugely honoured to meet and share precious moments with. Rest in peace.”

Born Doris Mary Ann von Kappelhoff in April 1922, Day landed her first professional singing gig at the age of 15. Her first hit, “Sentimental Journey”, was released in 1945 and became an unofficial homecoming song for many Americans who fought in the Second World War.

After hearing Day’s rendition of “Embraceable You”, the songwriters Jule Styne and Sammy Cahn recommended Day to Warner Bros for the leading role in Romance on the High Seas. Day managed to impress director Michael Curtiz and landed the part, making her cinematic debut in 1948.

From there, Day signed a multi-film contract with Warner Bros and starred in its films Calamity Jane, Lucky Me and Young at Heart, the latter with Frank Sinatra. Deciding not to renew the contract, Day scored her most successful film to that date with Love Me or Leave Me in 1955.

Doris Day as Calamity Jane in the 1953 film (Rex)

The late Fifties and early Sixties brought about her most successful period, with Day starring in three box-office toppers with Hudson. She also collaborated twice with James Garner, the pair staring in The Thrill of It All and Move Over, Darling together.

Despite the string of Hollywood hits, Day found herself in huge amounts of debt after her third husband, Martin Melcher, squandered all her earnings. After he died in 1968, Day was forced to turn to television and starred in The Doris Day Show until 1973.

Day returned to television in 1985 to host 26 episodes of Doris Day’s Best Friends and never again appeared in a film, her last being the 1968 romantic comedy With Six You Get Eggroll. She instead focussed on animal rights and became a welfare activist.