"House"-hold name: Elle Fanning as Stella. "House"-lights: Stella is the daughter of the patient of the week, a woman named Margo who is secretly negative fertility treatments with birth control pills because she doesn't want another child and is also taking her daughter's Ritalin because she can't deal with every day life. The three drugs in combo have caused a tumor in her liver. House takes a liking to precocious little Stella. Out-"House": Elle Fanning is the younger sister of actress Dakota Fanning and most recently was seen playing the young Daisy in "The Curious Case of Benjamin Button."