Donny talks about Marie's onstage accident

Donny Osmond is dishing the dirt on his sister and singing partner, Marie, in Parade magazine.

Of course, being the Osmond's, the dirt is rather cleaner than most people's (which is why it's in Parade and not the National Enquirer).

Namely, Donny talks about the recent incident on a cruise ship, where Marie laughed so hard she wet herself onstage. Here's Donny's account:

"On the final night, there was a video that they put together of the entire cruise and it was the worst thing I have ever seen in my life! At the very end of it, Marie and I looked at each other like 'What are we gonna say?' So we were trying to be very polite, saying that it was sweet, and I said, 'I wonder who put that together?' And Marie said, 'Well, whoever did is not going to do it next year!' And that just started the process. She lost it, and then I lost it, and finally she just peed her pants! She tried to cover it up, but there's no way to cover it up. It just got worse and worse and funnier and funnier. She was so embarrassed about it, but I kind of consoled her. The other night, she said, 'How do I redeem myself from this?' I said, 'Marie, you are now extremely normal. So many people can relate to you,' and she embraced it. It's so important to just be yourself."