She has known Spencer Breslin and Abigail Breslin (her Raising Helen (2004) co-stars) before they could talk.

In 2007, Forbes Magazine estimated her earnings for the year at $2 million.

As Lizzie Spaulding on "The Guiding Light" (1952), Hayden had to deal with difficult story lines in which she shot and killed her mother's abuser, been kidnapped, gone through both of her parents remarrying, and just recently battled leukemia.

Girlfriend of Milo Ventimiglia.

Older sister of Jansen Panettiere.

Her last name is pronounced "Pan-Uh-Tee-Air-Ee"; the Italian translation is "Baker".

Is best friends with Daniella Morris.

2000: Was nominated for a Grammy for Best Spoken Word Album for Children for A Bug's Life (1998) Read-Along.

2000: Childstarlets.com's Actress of the Year.

In "The Guiding Light" (1952), for Hayden's character Lizzie's battle with leukemia, the show received a Special Recognition Award from The Leukemia and Lymphoma Society for bringing national awareness of the disease to the attention of daytime viewers.

Has two dogs, named Penny Lane and Madison.

Was originally cast to play Sarah Altman in Panic Room (2002) but was later replaced by Kristen Stewart.

Her mother used to be a soap opera actress.

Parents are Lesley R. Vogel, a former soap opera actress, and Alan L. "Skip" Panettiere, a fire department lieutenant. Coincidentally, her first rescue on "Heroes" (2006/II) was from a train wreck fire.

Her last name was printed wrong in an issue of the "Discovery Girls" magazine where she was considered an "Exceptional Tween".

7/21/98: Soap Opera Magazine's star of the week.

Appeared on "The Tonight Show with Jay Leno" (1992) on December 30, 1998.

Has a partnership with United States Postal Inspection Service and the National Center For Missing And Exploited Children in a campaign against online predators, called 2 SMRT 4U.

Is vegan and a supporter of ALF (Animal Liberation Front).

Hobbies include singing, dancing, horseback riding, gymnastics, taking piano lessons and swimming.

She takes karate and boxing lessons.

Has appeared in over 50 commercials.

Began her acting career at 11 months when she appeared in a commercial for Playskool.