A native of New York City, she first appeared in a commercial at the age of 11 months.
She is known for her roles as cheerleader Claire Bennet on the NBC sci-fi series Heroes (2006–10), Juliette Barnes in the ABC/CMT musical-drama series Nashville (2012–present) and Kairi in the video game series Kingdom Hearts.She has one younger brother, fellow actor Jansen Panettiere.She landed a role as Sarah Roberts on the ABC soap opera One Life to Live from 1994 to 1997, which was followed by Lizzie Spaulding on the CBS soap opera Guiding Light in 1996, and again from 1997 to 2000.Rich and weird: Kelly is best known for starring on the reality series The Osbournes (here she is pictured with her parents, brother Jack and Robert Marcato in 2002). on Fashion Police under the guidance of Joan Rivers Kelly's mother Sharon will be thrilled to hear of her daughter's new relationship status as she recently admitted she's been scouring the web for possible suitors because she's desperate for her to settle down.'I know I'm incredibly intimidating, nobody around my age isn't terrified of me and I'm not into dating younger guys. Itâ€™s fun to do a small film that might be released to DVD not because itâ€™s a horrible film, but because itâ€™s an independent film.