Singer Kelly Clarkson has barred her children from watching "From Justin to Kelly," a 2003 musical comedy in which she starred. Clarkson, who won the first season of "American Idol" in 2002, made the admission during her final Las Vegas concert on Saturday.

Clarkson, 44, told the audience that she was "contractually obligated" to make the film after winning the reality competition, explaining that she did not realize her victory would require her to do a movie. "Man, read the fine print, you know," she said, according to a video obtained by Us Weekly. "I didn’t know that if you won, you had to do a movie. Not all of us want to be Meryl Streep, we just like watching her, OK?"

She starred opposite "American Idol" season one runner-up Justin Guarini in the film, which followed two young people who meet and fall in love while on spring break. Despite a fan at the concert defending the movie, Clarkson offered a blunt assessment, calling it "s---."

Despite her negative feelings about the film itself, Clarkson acknowledged that the musical aspect of the project was enjoyable. "The music part, that was fun," she stated. "See? You gotta find the positive, motherf—ers, you know? Turn that s— into lemonade … and cry yourself to sleep."

"From Justin to Kelly" was released in 2003, one year after Clarkson's "American Idol" victory. Her children, River Rose, 10, and Remington, 8, will not be introduced to the film anytime soon, she confirmed.