Actress Mackenzie Rosman joined the cast of "7th Heaven" at just seven-years-old in 1996. Rosman played littlest sister and minister's daughter, Ruthie Camden, until 2007, when the longtime series ...

Actress Mackenzie Rosman joined the cast of "7th Heaven" at just seven-years-old in 1996. Rosman played littlest sister and minister's daughter, Ruthie Camden, until 2007, when the longtime series ...

— Mackenzie Rosman (@Mack_Smack) March 28, 2013. Biel, who played Mary Camden on the show, posed topless for Gear magazine in 2000 when she was just 17.