Published Monday, 23 August 2010
Millions of viewers saw Johnson, a single mother, get through to the boot camp stage of the X Factor on Saturday night after she performed, in leopard skin leggings, a bizarre rendition of the Duffy track Mercy.
Johnson told the X Factor judges that she was 30, but the age on her online Miss Great Britain form was 28, said a spokeswoman for the contest, which is for those aged 29 and under.
The aspiring star had applied for the competition in February and was due to compete in the next regional heat, Miss Essex GB, on Saturday, spokeswoman Charlotte Ellis said.
She had failed to get through the Miss London and Miss South East regional heats.
Miss Great Britain chief executive Liz Fuller said: "It's such a shame to lose Shirlena, though she did apologise. I have great warmth for this girl as being one of the most eccentric contestants I had. I hope the advice I gave will help her."
Johnson was seen shrieking, wailing, kicking and moaning during her performance on the X Factor, and got through despite confessing that she had forgotten the words to her song.
Simon Cowell, who voted Johnson through, told her: "It was like a musical exorcism," but added: "I have to say I love you. You are completely crazy but I like that. You are fantastically nuts."
Miss Great Britain celebrates its 65th anniversary this year.