Pieterse, originally from Johannesburg, South Africa, lived in Las Vegas with her show biz parents before the family moved to Los Angeles. Pieterse became accustomed to the rigors of a career in entertainment, as her parents were a professional acrobatic dance team who performed all over the world.
When she was just 4 ½ years old, Pieterse met with a Los Angeles agent who quickly signed her and she has been acting and modeling ever since. She has appeared in scores of television commercials, on billboards and booked modeling assignments throughout the country.
Pieterse got her start in television in 2002 at the age of 6, starring in the WB comedy series Family Affair, a remake of the late 1960s hit, as Buffy, opposite Gary Cole. She was awarded with a Young Artist's Award for her work on the series. Pieterse later reunited with Cole as his daughter in the cable thriller Wanted.
Pieterse's first major film role was as the Ice Princess in Robert Rodriguez's The Adventures of Shark Boy and Lava Girl 3D, with Taylor Lautner and George Lopez. She also starred in Good Luck Chuck and in the telefilm Claire, opposite Valerie Bertinelli. Pieterse recently appeared in the hit series Heroes in the recurring role of Amanda Strazzulla, a young gypsy girl with fire powers. She also guest starred in House M.D., as a terminal cancer patient who was terrified of dying without ever being kissed, and in Without a Trace, in a terrifying turn as a kidnapping victim.
When she's not out by the pool reading or hanging out with her friends, Pieterse enjoys writing and singing country music. She also designs jewelry, dances and plays racquetball and golf with her father. An only child, Pieterse calls her Pekinese Precious and her goldfish Crystal "siblings."