Diane Keaton, the quirky US actress who won an Academy Award and captured hearts with her endearing performance as Woody Allen's eccentric, insecure girlfriend in the 1977 romantic comedy Annie Hall, has died at the age of 79.

US magazine People reported Keaton died in California on Saturday and her loved ones have asked for privacy, a family spokesperson told the outlet.

Keaton, who appeared in more than 60 films, including The Godfather trilogy, The First Wives Club and eight films with Allen, stood out in Hollywood with a personal style that favoured androgynous looks, turtleneck sweaters and her trademark hats.

She earned Oscar nominations for best actress for her portrayal of US journalist Louise Bryant in the 1981 political drama Reds, as a caring aunt to Leonardo DiCaprio in the

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