Movie: Mamma Mia! (2008)

We knew from Mean Girls (2004), Veronica Mars and Big Love that young Seyfried was an incredibly, jarringly pretty young girl, but what those roles didn't tell us was that she had studied Broadway-style song-and-dance, and even opera. When she busted out "Gimme! Gimme! Gimme! (A Man After Midnight)" in Mamma Mia!, we realized she's truly a multifaceted talent.