Demi revealed to Tiger Beat: 'I had to wear a really tight, corseted princess dress for a skit on Sonny With A Chance. I didn't realize that I had to shoot more of the scene later so I ate an entire Chipotle burrito for lunch and chugged two bottles..

..of water. I had to squeeze myself into the dress and it was so tight that I threw up! I was like, 'I don't feel good,' and I ran out and threw up in the parking lot! I twas funny, but I felt better later!