Peter Land, Lynne's husband, tweeted this evening to announce the news of her death at 6.20pm on 1 July at the Princess Grace Hospital.
The announcement comes days after Andrew Lloyd Webber officially renamed the West End's New London Theatre the Gillian Lynne Theatre.
Lynne had an extraordinary career on stage and beyond as the choreographer behind some of the most important British musical theatre creations. Her iconic work included the movement in Cats, The Phantom of the Opera and Aspects of Love.
Over 50 years in showbusiness, she worked for companies and organisations including the Royal Opera House, the RSC and The Australian Ballet.
Lynne began her career as a dancer with Sadler's Wells Ballet and had roles created for her by Frederick Ashton and Robert Helpmann. Lynne also directed for The Muppet Show.
She was made a dame in 2014. One of her final appearances was at the New London Theatre on 22 June when Lloyd Webber and Cameron Mackintosh paid tribute to the dancer and choreographer. On the day, Mackintosh said: "The two things I learnt on the first day of rehearsals [with you] was that you had the wickedest sense of humour ever and you liked to get your own way."
He added: "You've made many stars look wonderful over your career, but today you are the star of this theatre."
Other awards recieved by Lynne include a Special Olivier Award in 2013, an Olivier Award for Cats, a CBE and two Tony nominations, for the choreography on Cats and The Phantom of the Opera.
Land's tweet read this evening:
Rest In Peace my darling Gillie. I am heartbroken to write that Dame Gillian Lynne DBE & my dearest wife & friend & love for 40 years passed away at 6.20pm tonight 1st July 2018 at the Princess Grace Hospital. She leaves behind a huge legacy&is adored by many espec @peterland_uk pic.twitter.com/Rn3182mRPt
— Dame Gillian Lynne (@Gillian_Lynne) July 1, 2018
RIP Dear Gillie… you supported and inspired me from the very beginning… your spirit & love of dance & dancers lives on in all of us who share that love @Gillian_Lynne #DameGillianLynne all love to @peterland_uk x pic.twitter.com/g2jzQwNaGf
— Matthew Bourne (@SirMattBourne) July 1, 2018