Death Becomes Her

Death Becomes Her is a movie starring Meryl Streep, Bruce Willis, and Goldie Hawn. When a woman learns of an immortality treatment, she sees it as a way to outdo her long-time rival.
Madeline is married to Ernest, who was once arch-rival Helen's fiance. After recovering from a mental breakdown, Helen vows to kill Madeline and steal back Ernest. Unfortunately for everyone, the introduction of a magic potion causes things to be a great deal more complicated than a mere murder plot.