Julie Alexandra Mayer is a fictional character on the ABC television series Desperate Housewives. The character is played by actress Andrea Bowen, and first appeared in the pilot episode of the series in 2004. She is the daughter of Susan Delfino (Teri Hatcher) and Karl Mayer (Richard Burgi). They share custody of Julie, though she lives primarily with Susan. Julie is characterized as "bright and self-sufficient and extremely mature for her age." She often acts as the parental figure in her relationship with Susan, especially following Susan's divorce from Karl. However, since the 6th season, Julie's personality has changed quite a bit, with her saying she was no longer the "perfect" daughter.