Early life　　Tom was born in Hinsdale, Illinois, to Charles and Marie Tom. She has a twin brother, David Tom, best known for his role as Billy Abbott on The Young and the Restless. Tom also has an older sister Heather Tom, who is best known for her role as Victoria Newman McNeil Howard on The Young and the Restless.　　Career　　In 1992, Tom played the small role of Scott Scanlon's sister, Sue, on Beverly Hills, 90210. Also, in 1992 and 1993, Tom played Ryce Newton in the successful family movies Beethoven and Beethoven's 2nd. She did not appear in the last three sequels as she had grown out of her specific role, although she did reprise her role as the voice of Ryce in the cartoon spinoff.　　From 1993 to 1999, Tom played the role of Mr. Sheffield’s eldest daughter, Maggie Sheffield in The Nanny. This is perhaps Tom’s best known work as an actress.　　From 1998 to 2006, she provided the voice for Supergirl in the DC Animated Universe.　　In 2000, Tom played Sarah Bryan in the Fox Family television film Ice Angel as well as Tracy in Panic. In 2001, she portrayed a teen reporter named Cassie in The Princess Diaries.　　In 2006, Tom co-starred in the IFC original The Minor Accomplishments of Jackie Woodman as Tara, an underling at a film production company. Tom played a small role in"Loose Ends", the September 20, 2007 episode of Burn Notice.[1]　　In March 2008, she starred in the Lifetime movie Her Only Child, which premiered on March 22, 2008. She guest starred alongside brother David (who played her character's brother) in"Damaged", the April 2, 2008 episode of Criminal Minds. She also guest starred on the May 4, 2008 episode of Cold Case.