1. Loretta Young
Most Infamous Moment: Young had a secret love child with costar Clark Gable.
During filming of The Call of the Wild, Young and then-married costar Clark Gable began having an affair which resulted in Young's pregnancy. To protect both of their images, Young hid the pregnancy, gave an interview while under blankets saying she had a disease from childhood, and took a "vacation" to England.
When she returned home to Venice, she kept her baby, actress Judy Lewis, for a few months before sending her to an orphanage. When Judy was 19 months old, Young returned for her, making the public believe she had adopted a baby instead of having a secret love child. Judy even had surgery to pin back her ears she inherited from Clark Gable.