Grace Margaret "Gracie Maggie" Kleinschmidt
Luanne revealed her pregnancy to Lucky and the Hill family in the episode "Edu-macating Lucky." The two ended up having a shotgun wedding, even though they had wanted a more traditional ceremony.
When Gracie was born, Luanne was originally going to name her Lasagna, for one of her and Lucky's favorite things. Thanks to great-aunt Peggy's and Great-Uncle Hank's intervention she was named Gracie instead, and her middle name was given by Peggy, who named her after herself using her full name, Margaret.
Gracie is an extremely happy baby most of the time, giggling and doing strange things that make her laugh. She last appeared in the series finale.