Kimberly Wyatt's "horrendous" acne almost cost her a place in Pussycat Dolls and made her lose all confidence.
The 34-year-old singer admitted she felt a "pressure" to look good when she first moved to Los Angeles, and lost all her confidence when she developed the skin condition.
She said: "The pressure to look good intensified when I moved to L.A and I got horrendous cystic acne. It was the start of the Pussycat Dolls - it crushed my confidence and nearly cost me a place in the band."
But it wasn't just her pop star days that Kimberly found tough.
She said: "I was picked on when I was younger for having a flat chest - the kids would rub a wall and go, 'Oh, Kimberly!' I was never the pretty girl.
"I had weight problems when I worked on cruise ships. When my costumes didn't fit during the quick changes, I had to be weighed every week."
Kimberly - who has 15-month-old daughter Willow with husband Max Rogers - overcame her skin problem by changing her diet, and now makes exercise and stress management a priority in her life.
She said: "I tried medicine, but nothing worked so I changed the food that I ate. I realised that stress is the biggest part of any kind of ailment so managing that became my focus. I got into fitness, spent time outdoors and wrote a journal.
"Yes [I have days when I lack confidence] but I make sure I eat healthily or exercise with Max - he's always a good confidence booster. I came into my own as a woman when I met him. He made me feel beautiful in a way I'd never felt before and encourages me to get fit. He'll also take over the baby shifts so I can work out."