The singer was performing on a cruise ship in the Bahamas with her brother Donny Osmond recently, when she literally "p---ed herself" laughing.
Shortly before the video footage starts up, Donny cracks a joke that causes Marie to collapse on the floor with laughter … And then the poor woman has no choice but to stay where she is once she realises she's wet herself.
To her credit, the 52-year-old manages to laugh her way through the whole nightmare, even the cringeworthy moment when she tells the audience, "I peed my pants!" and a stage hand brings her a towel.
Oh gawd. This has got to be a star's worst nightmare!
If it's any consolation, Marie, you're not alone. Black Eyed Peas singer Fergie had a similar little accident on stage back in 2005.