MARIAH'S MERRY LIFE CARRIES MAJOR RISKS!

Late-night partying puts health on the line

- 

MIDNIGHT rambler Mariah Carey's all-night partying is not only taking a toll on her stage performances but may also be negatively affecting her health, sources tell GLOBE! Fans were shocked after video of a recent concert showed Mimi's "painfully slow" movements on stage.

One commenter snarked, "Why is she moving like she's 105 years old?" Her stilettos were part of the problem, snitches a source: "They were too high and she could barely walk in them." But the Emotions singer,

55, is desperate to keep up with decades-younger stars by wearing sky-high heels and skimpy outfits.

"But people are also convinced she's not taking care of herself," spills a spy.