As über-popular mean girl Karen Smith, a vapid blonde who claimed she could predict the weather with her breasts, Seyfried proved it took serious smarts to play dumb. A high-profile part on "Veronica Mars" followed, along with guest roles on "House M.D.," "Law & Order: Special Victims Unit" and "CSI: Crime Scene Investigation." She also landed a recurring role on "Big Love."
Seyfried's other big-screen credits include Mamma Mia! (2008), a movie musical of ABBA songs based on the hit Broadway show of the same name. A trained vocalist, the actress did all her own singing for the role.
Unfolding via interwoven narratives, this touching drama follows novelist Jake Davis after he loses his wife in a car crash and becomes a single dad to 5-year-old Katie, who's still struggling three decades later to overcome her tumultuous childhood.