Most people recognize Hayden Panettiere as the indestructible cheerleader on "Heroes" (2006 to 2010) or as "Nashville" singing sexpot Juliette Barnes. But this alumnus of many magazine lists (People’s Most Beautiful, FHM’s Sexiest Women) started working the camera long before she could even lift a pompom. Her mom, a soap actress, started her in modeling and commercials at 8 months old. The current Neutrogena spokesperson has hawked everything from Hershey's to lice shampoo. She followed in mom’s footsteps, appearing on "One Life To Live" from 1994-1997 and "Guiding Light" until 2000. She provided a voice in "A Bug’s Life" and became Hollywood’s go-to daughter ("Remember The Titans" and "Ally McBeal"). She completed her freshman year in South Africa while filming "Racing Stripes." Returning to the U.S., she took on more teen-oriented roles, started partying with socialites like Paris Hilton and let her penchant for older men like Laguna Beach’s Stephen Colletti and fellow hero Milo Ventimiglia become public. The "Scream 4" actress broke her senior streak by hooking up with wide receiver Scotty McKnight, but is now engaged to a former flame (who is 13 years older than her) boxer Wladimir Klitschko. They are expecting their first daughter in late 2014 and her pregnancy will be written into "Nashville." She is also such a dedicated to marine life activist her protest of dolphin hunts in Japan led that country to issue a warrant for her arrest.