Kristen Stewart and a very grown-up Dakota Fanning Wednesday looked every bit the late 70s while on the set of The Runaways, the Joan Jett biopic.

See more photos of Kristen & Dakota on the set of The Runaways

Its amazing how the authentically 70s the Twilight actresses come off as, considering neither was even alive in the 80s: Stewart was born in April 1990, while Fanning in February 1994.

The Runways hits theatres next year.