Nicole Scherzinger is opening up about her battle with bulimia.

The 36-year-old former Pussycat Dolls singer says she was in a “dark place” during her seven-year tenure with the group. “I had such a great life on the outside, the Dolls were on top of the world, but I was miserable on the inside,” Scherzinger said in Cosmopolitan UK.

She went on to explain that she kept it a secret for years.

“It’s such a horrible, paralyzing disease and it was such a dark time for me,” said the “Don’t Cha” singer. “I didn’t think anyone knew in my group or in my family because I hid it that well, I was so ashamed. I knew it wasn’t normal or healthy because I was hurting myself through this cycle of disordered eating.”

Scherzinger, who’s dating Formula One racer Lewis Hamilton, says she didn’t get her life back on track until she passed out on tour.

“I had started losing my voice, I couldn’t sing at shows, and then I remember my manager finding me passed out on the floor in Malta or in the south of France,” she recalled. “I thought, ‘I’m going to lose everything I love if I don’t love myself’ … I’m never letting that happen again; you only got one life — I was 27 only once.”