Blake Ellender Lively was born in the Tarzana neighborhood of Los Angeles, California, to Elaine and Ernie Lively.

At age 10, Lively made her professional debut in her father's directorial project, "Sandman", playing the role of Trixie / Tooth Fairy.

Lively graduated from Burbank High School, where she was a cheerleader, a member of the championship choir, and class president.