US singer and actress Jennifer Hudson hailed Flack as “one of the great soul singers of all time” in an Instagram tribute alongside a black and white photo of the singer.
Ono, 92, who was a neighbour of Flack’s when she lived in New York City’s Dakota Building with John Lennon, posted a photo of the three of them with David Bowie and wrote: “Roberta Flack Rest In Peace.”.
A host of other celebrities including US chat show host Oprah Winfrey and singer Yoko Ono have paid tribute to the soul star who died on Monday “surrounded by her family”, her publicist said.
Elsewhere, Sex And The City actress Sarah Jessica Parker said listening to Flack “was blissful” in a social media post while director Clint Eastwood wrote “rest in peace” next to a photo of the two.
Canadian pop star Dion, 56, said in a post to social media on Tuesday: “With a heavy heart we have to say goodbye to Roberta Flack.