Rosman was born in Charleston, South Carolina and has some Cherokee Indian ancestry. In 1996, she got the part of Ruthie Camden on 7th Heaven by personally greeting each person in the room by a handshake during her audition. In addition to her role on 7th Heaven, Rosman appeared in the independent film Gideon, starring Christopher Lambert, Charlton Heston and Shelley Winters. She has appeared in numerous television commercials starting at age four including a Tuff's Diaper commercial and a Nike shoe commercial. Her film roles have been; JonBenet Ramsey in Getting Away with Murder: The JonBenét Ramsey Mystery, played Molly MacLemore in Gideon and recently played Bree in Proud American which is due to be released in 2008. And her most recent film that she is rumored to be involved in is Word of Mouth and will play the role of Jill.Her most recent commercial was a Kmart advertisement with 7th Heaven co-stars Beverley Mitchell and George Stults. Her parents divorced when she was young, and she currently resides in Santa Clarita, California with her mother Donna, stepfather Randy, and younger brother Chandler (b. 1992). She also has an older step-sister, Katelyn Salmont (b. 1986). Also included in the mix of the household is a menagerie of cats, dogs, fish, a rat, chickens, horses, goats and even a pig. Her greatest passion outside of acting is animals, especially horses, of which she owns many, including; Mentos, Sugar, Baby, Easy Mocha, Zena, Fantasia and Harmony. She is a competitive equestrian show jumper, and rides in jumping competitions using her horse Mentos Junior. Rosman is an active supporter of fundraising for the Cystic Fibrosis Foundation and wishes to help educate the public about the need for organ donation. Mackenzie's stepsister, Katelyn Salmont, lives with cystic fibrosis and in late 2005, Salmont underwent a successful double lung-transplant. Her father Randy donated one organ. Both girls were featured in Teen People's "20 Teens Who Will Change the World". 7th Heaven produced a special episode about cystic fibrosis entitled "Back in the Saddle Again" which featured Salmont as herself, and Rosman and Salmont rode horses together, as they do at home. In 2005, 7th Heaven again brought Salmont on the show, post-transplant, which gave her a chance to explain about the new life she had been given. Rosman also supports Childhelp Inc.; she is an ambassador for the organization, which helps severely abused children. Rosman is also the national honorary chairman for CureFinders, a school fund-raising program to help fund the search for a cure for cystic fibrosis. She graduated from high school in late May 2007. She has since decided to take a year's break to travel. She was in Madagascar for a month with a group of other young people her age to learn about the culture, the country and its people. Wikipedia