Other acts confirmed for the festival in August are Sophie Ellis-Bextor, Billy Porter and S Club.
Myers, one half of the motorbike-riding TV cooking duo, was diagnosed with cancer two years ago.
The 25-year-old's taking a break from social media after she was sent "vile threats" while on the show.
The celebrity recently revealed she used weight-loss drugs as a "maintenance tool."
Kieran Smith, from Love Productions, says the name of James Turner Street should have been withheld.
Gemini was co-founded by twins Tyler and Cameron Winklevoss - known for their legal dispute with Facebook.
Gemini was co-founded by twins Tyler and Cameron Winklevoss - known for their legal dispute with Facebook.
Gemini was co-founded by twins Tyler and Cameron Winklevoss - known for their legal dispute with Facebook.
Gemini was co-founded by twins Tyler and Cameron Winklevoss - known for their legal dispute with Facebook.
The pop star makes history at the Brits with six wins, after one of the biggest comebacks in pop.