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The former Atomic Kitten singer, 42, previously told fans she felt like she was 'going to die' and had arranged a call with her doctor when her throat and chest felt 'tight'.
EXCLUSIVE: Kerry Katona has shared her devastation at missing out on "special moments" with her eight-year-old daughter Dylan-Jorge due to her busy work schedule
The music legend, 75, is set to take to the Pyramid stage next summer at Somerset's Worthy Farm and could join the likes of Harry Styles and Eminem.
The reality TV star, 42, who has now been clean for over a decade, confessed that she used drugs as a 'coping mechanism'.
The event, held at Worth Farm in Somerset, will take place from Wednesday 21st June to Sunday 25th June next year.