Is American Idol Singer Kellie Pickler Heading for Collapse?

Is American Idol finalist Kellie Pickler suffering from health problems?  The buxom country singer has cancelled three concerts since June 22- and insiders say it's because she's on the verge of collapse, reports Star Magazine in this week's issue.  After Kellie, 21 came in sixth on the 2006 season of American Idol, her first CD, Small Town Girl, debuted at No. 1 on the country charts, and her latest single, "I Wonder," has climbed into the top 20.

Is American Idol Singer Kellie Pickler Heading for Collapse?

But insiders tell Star she's making herself ill on tour with country giant Brad Paisley . "She’s under a great deal of pressure to be slender and slinky,” an associate explains in the report from Star.

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I think she looks great.  "Kellie’s trying to lose weight, but that’s near impossible when she’s working 14 hours a day,” the source adds. “Something has to give, and unfortunately it’s her health.” Kellie- who has lost about 20 pounds since last spring- cancelled two shows in Colorado and one in New Mexico. “She needs to eat and rest more,” says the source. “There’s a real fear that she won’t hold up.”

Cue the rep™:  Kellie’s rep, Wes Vause, admits to Star that the singer is a “picky eater” and canceled shows “because of low blood sugar.” Vause tells Star that Kellie “had gone to Canada and didn’t eat enough, so she needed to get her strength back. She is well.”