Courtney Elizabeth Jines was born on May 4, 1992 in Fairfax, Virginia. She is a "lifelong actress" who has been acting professionally since the age of 6. Courtney made her first television appearance in 2000 in the episode "Demolition Derby" of the television series Third Watch as Lisa Hagonon. Her first role in film was as Harriet Deal in Drop Back Ten (2000) and Hannah Miller in the Law & Order episode "Pixies" in 2001. She played Delilah in Gaudi Afternoon (2001) and Jessica Trent in the CSI: Crime Scene Investigation episode called "Cats in the Cradle" in 2002. In 2002, she played Julie Morgan in Anna's Dream. In 2003 she played Kristen Farrell in the television series That Was Then, and Rachel in the ER episode "A Saint in the city." She was in Red Betsy as Jane Rounds, and played Demetra in Spy Kids 3-D: Game Over, which was when the then-long-blonde-haired Courtney cut her hair and dyed it brown; she has left it that way ever since. Spy Kids 3 is also the role that Courtney is most famous for, and she was known as "the deceiver". In 2004, she guest starred on Jack and Bobby is Deena Greenberg in the episode "Today I A a Man." In 2005, she starred as Bridget Byrne in Silver Bells and Amanda Wilkinson in Because of Winn-Dixie.

She also has two dogs, and fish. In addition to acting she enjoys singing, dancing, and playing the piano and guitar. She also loves to dance, horseback riding, biking and shop. She is very passionate about animals and has plans to be an "acting veterinarian" as an adult. Courtney is very proud of her association with Special Olympics, where she serves as a coach.



Unlike her character, Demetra, she actually has long blonde hair. The director of "Spy Kids 3-D: Game Over" cut and dyed her hair dark brown for the movie. She has decided to keep it that way. She also has a slightly rounder face and softer features than Demetra.