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Joni Mitchell speaks at the Isabel Bader Theatre as part of Luminato festival, Sunday, June 16, 2013, in Toronto. Mitchell was hospitalized in Los Angeles on Tuesday, March 31, 2015 according to the Twitter account and website of the folk singer and Rock and Roll Hall of Famer, but details on her condition have not been released. (AP Photo/The Canadian Press, Galit Rodan) Image Credit: AP

Joni Mitchell’s famous fans are voicing their support and worry for the folk song icon while she is hospitalised in Los Angeles.

Harry Potter star Emma Watson said on Wednesday on Twitter that she hasn’t “been able to concentrate” since hearing about the Rock and Roll Hall of Famer’s sickness.

Kiss lead singer Paul Stanley tweeted a recent picture of himself and Mitchell, telling his followers to send her love and prayers.

Kevin Bacon, Boy George and Tori Amos were also among the well-wishers.

According to her Twitter account and website, Mitchell was found unconscious in her home on Tuesday night and taken by ambulance to a hospital. She was later in intensive care and undergoing tests.

There was no further word on her condition on Wednesday.