Having begun her acting career at the tender age of seven, MacKenzie Rosman has been an actress for most of her life. She is best known as Ruthie Camden, the precocious youngest daughter on "7th Heaven," the longest running show on the network formerly known as the WB (now the CW). The series, about a preacher and his family, was one of the most successful projects produced by Aaron Spelling, and helped carry the network during its most popular period. Rosman appeared in over 200 episodes throughout the family drama's 11-year run, until the finale in 2007. She essentially grew up onscreen, and her post-"7th Heaven" work has included a foray into horror, with 2009's "The Tomb," an extremely loose interpretation of the Edgar Allen Poe short story "Ligeia." Rosman returned to family programming in 2010 with a small recurring role on "The Secret Life of the American Teenager" as Zoe, a promiscuous teen. In late 2008, her stepsister Katelyn died from complications related to cystic fibrosis. Rosman is now a prominent supporter of the Cystic Fibrosis Foundation, helping to raise awareness and money for research and treatments. She is active in other charities as well, including Childhelp, which works to prevent and treat child abuse.