Only 53 films have ever reached the $1 billion mark at the box office. And ‘Barbie’ is about to join them. Barbie has been crushing it at the box office, and the momentum hasn’t slowed down. Now, Greta Gerwig is on track to become the first female filmmaker to break the billion-dollar barrier, likely this weekend—just in time for her 40th birthday.Thanks to an epic marketing push by Warner Brothers, the film has already broken records.