But, did you know an 11-year-old Panettiere belted out Britney Spears' "(You Drive Me) Crazy" on The Rosie O'Donnell Show?
Brian Pocrass and the rest of the people at 22 Vision, a production company in LA, unearthed this rare footage of Paniettere, six years before she'd star in Heroes.
And she got really into it.
She even started clapping at one point to get the audience involved.