Steps star Claire Richards was told she was too thin to take part in I'm A Celebrity... Get Me Out Of Here by producers.
The singer said producers hadn't realised she'd lost weight and wanted her to be fatter to go on the show.
Claire has had a well-documented battle with her weight - until she found a weight loss programme that suited her, leading to her maintaining her skinny frame.
She had previously taken part in a BBC Three programme which followed her pre-wedding weight loss efforts in 2009 - reports Mirror Online.
Speaking on podcast, Official Charts: Take The Hit, Claire said her weight loss ultimately cost her a place as a campmate in the I'm A Celebrity jungle.
She said: "I went for a meeting (with I'm A Celebrity) once, a long, long time ago. But it was a time when I'd just lost quite a lot of weight but they didn't realise that I had.
"They wanted me to be fat apparently. That was the excuse I got back, that I was too thin."
Claire added: "I'm glad, because I watch it on TV now and I love it but I know I wouldn't last two seconds."
Claire has appeared on a numer of reality shows such as Popstar To Operastar, Celebrity Big Brother and Get Your Act Together.
She said: "I did go through a period of time where I just decided that I was going to do stuff that came my way even if it terrified the life out of me. Hence why I was on telly eating fire."
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An ITV spokeswoman said: "I'm A Celebrity would never cast campmates based on their shape or size - all celebrities are assessed for their suitability to life in the jungle."
