The "American Idol" alum who simulated oral sex and shared a same-sex lip lock on stage said he used to be a hefty high school kid who would feed off his audiences' reactions to his performance.
"When I was in high school I was 250 pounds and that creates some stuff ... some body image stuff, some confidence issues, and I got a lot of my confidences from validation I got as a performer," he told the radio station.
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Lambert stopped short of apologizing for his kinky stage act but said he "did get carried away." The performance drew 1,500 complaints and caused him to be booted from G-rated ABC morning show "Good Morning America."
The 27-year-old singer came out as gay in an interview with Rolling Stone earlier this year. He'll be a guest on "Ellen" on Tuesday.