Kelly Cheats Death In Hospital Drama!

Emergency surgery for appendix agony.

SUPER trouper Kelly Clarkson lives by the old saying, “the show must go on” — and it nearly killed her!

The 37-year-old songbird ignored excruciating pain for days before undergoing an emergency appendectomy just hours after hosting the Billboard Music Awards!

“Kelly was in such discomfort, she had to stand up during breaks while working on The Voice since sitting was so painful,” a source tells GLOBE.

“She knew something was seriously wrong, but she was determined to fulfill her commitments.”