Demi Lovato is opening up about a painful experience she shared with former costar Alyson Stoner. "I remember one time you followed me into the bathroom" while filming Camp Rock,

Back in 2008, preteens, tweens, and youth across America were singing along to "This is Me" and wishing they could become music superstars thanks to the Disney Channel Original Movie Camp Rock starring Demi Lovato, the Jonas Brothers, and Alyson Stoner.

In the new Demi Lovato documentary on Hulu, Child Star, the current singer and former Disney star frankly speaks about—and apologizes for—her behavior on certain sets. That includes the set of Camp Rock 2, the sequel to the wildly successful 2008 Disney Channel Original Movie, which launched Lovato to fame.