Career: Hayden started her career in TV commercials when she was just 11 months old. She then won roles in the soap operas One Live to Live and Guiding Light. She found fame playing cheerleader Claire Bennet in the sci-fi TV series Heroes. She has also appeared in the teen comedy I Love You, Beth Cooper and won a role in Scream 4.
Relationships: Hayden has been linked to actor Stephen Colletti, her Heroes co-star Milo Ventimiglia and Welsh TV presenter Steve Jones. She has been dating heavyweight boxer Wladimir Klitschko since 2009.
FYI: Hayden is of Italian descent and her last name, Panettiere means baker.