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Kaylee Defer
Known to "Gossip Girl" fans as the conniving Ivy Dickens, Kaylee DeFer began acting in theater at the age of eight. After performing in high school plays in her hometown of Tucson, DeFer kicked off her professional career in 2004, with roles on the series "Drake & Josh" and "The Mountain." The actress won the role of teenage daughter Hillary in the family sitcom "The War at Home" in 2005, and made her feature film debut in "Upperclassmen" that same year. In addition to her work on "Gossip Girl," DeFer has also been seen on "Ghost Whisperer," "Bones," and "CSI: Miami."