<P> On December 22, 2015, Pieterse became engaged to her longterm boyfriend, Hudson Sheaffer . At the start of season 25 of Dancing with the Stars, she revealed that she was diagnosed with Polycystic Ovarian Syndrome, which contributed to her weight gain . </P> <P> Pieterse was featured on the cover of BELLO magazine "Young Hollywood", December 2014 issue . Pieterse appeared on the cover of the 2015 issue of TeenProm magazine . </P> <P> At six years old, Pieterse got her start in television, co-starring in 2002 as Buffy on The WB's remake of the CBS sitcom Family Affair (1966--1971). She guest starred in an episode of Stargate SG - 1 with Amanda Tapping as a little girl named Grace and in 2005, she appeared on an episode of House titled "Autopsy", portraying Andie, a young girl with terminal cancer . That same year, she made her film debut in The Adventures of Sharkboy and Lavagirl in 3 - D as Marissa, the Ice Princess, and also appeared as Millie Rose for two episodes of the short - lived TNT series Wanted, alongside her former Family Affair co-star, Gary Cole . </P> <P> Pieterse appeared in the 2007 film Good Luck Chuck, playing a young goth girl who places a curse on the titular character . She played the younger version of Sarah Michelle Gellar's character in the 2007 film The Air I Breathe, along with such co-stars as Kevin Bacon, Forest Whitaker, and Emile Hirsch . She also played a leading character in the Hallmark original film Claire, also released in 2007 . </P>

Who plays the ice princess in sharkboy and lavagirl
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