Ringwald said one person on the show ‘was really difficult’

"There was one person that was really difficult. And I’m not gonna say who that one person is," the 'Pretty in Pink' star said on 'WWHL.'

Molly Ringwald ranked all of her projects by experience and put "The Secret Life of the American Teenager" at the bottom because of a bad co-star.

Ringwald said one person on the show ‘was really difficult’