Biel was born to Jonathan Edward Biel and Kimberly Conroe; the family is of German, French, Irish, English and Choctaw Native American descent. Biel, who has a younger brother, Justin, grew up in Boulder, Colorado, where her family had moved when she was very young. She initially trained to become a vocalist with the hope of performing in musical theater and appeared in several musicals at an early age including The Sound of Music, Annie, Beauty and the Beast, and Anything Goes.

It...