MacKenzie Rosman is a child actress who had the grave misfortune of being stuck with the name MacKenzie. She was born on December 28, 1989 and is left handed. MacKenzie is best known for the role of Ruthie, the youngest daughter on the television show 7th Heaven. She also played the part of Molly in the film Gidgeon, and the part of Jon-Benet in a made for TV movie about the murder of Jon-Benet Ramsey.