Barbara Windsor's died at the age of 83.
The actress, who had Alzheimer's, passed away last night with her husband by her side.
She was best known for her roles in EastEnders and the Carry On films.
The British Prime Minister's tweeted his condolences saying the star "cheered the world up" when she was on screen.
She and her husband met Boris Johnson while campaigning for Alzheimer's sufferers last year.
Fellow actors on EastEnders have reacted, with Danniella Westbrook tweeting "my heart is broken", while Steve McFadden says he's "devastated".
Today we lost a legend a national treasure and a woman who I looked up too for most off my life. A generous warm funny humble and beautiful lady & someone who gave us all much joy watching her act. A woman who I was lucky enough to work with for many years as my mum & a loyal pic.twitter.com/yyPIqbwu3E
— Danniella Westbrook (@westbrookdanni) December 11, 2020
Main image: Dame Barbara Windsor after unveiling a portrait of herself by Welsh artist Dan Llywelyn Hall at L'Escargot in Soho, London.Picture by: Yui Mok/PA Archive/PA Images