Posting the news on her Twitter account, Katie's publicist wrote: "I am very sad to announce the death of Katie Boyle (Lady Saunders) who I was proud to represent in the latter days of her working career, and counted as a friend". She died peacefully at home on Tuesday, 20th of March, 2018.
Eurovision fans and viewers from beyond will remember Boyle's appearances as the host of the Eurovision Song Contest, having hosted the grand event on 4 separate occasions throughout the 1960s and 1970s. She therefore holds the record for presenting the contest most times.
Born Caterina Irene Elena Maria Imperiali de Francavilla in Tuscany in 1926, to Italian and English parents, Katie moved to Britain in 1946 and originally began her career as a model - posing for the likes of Vogue - before acting in several movies in the 1950s.
Boyle soon hit television screens across the United Kingdom in the same decade, featuring as a television personality and game-show panellist in shows such as What's My Line? and Juke Box Jury.
She hosted Eurovision four times between 1960 and 1974 and she also hosted the Ivor Novello music awards.
Katie returned to the contest as a special guest in 1998, when it was held in Birmingham following Katrina And The Waves' win for the United Kingdom the previous year - as well as being guest of honour at Eurovision conventions in 1988 and 1992.
On behalf of the entire Eurovision community we wish to extend our deepest condolences to Katie Boyle's loved ones.