She’s showing them how it’s done.

“The Official Release Party of a Show Girl,” the film that celebrates the debut of Taylor Swift’s new album, was queen of the box office on Friday, enjoying earnings of $15.8 million for its opener, according to The Numbers .

The film is being distributed by AMC Theatres from Oct. 3 to Oct. 5, and features behind-the-scenes footage, along with the pop star’s personal reflections on the new titles in her 12th album, “ The Life of a Showgirl ,” which was also released on Friday. 3

Swift’s flick, which The Guardian called a “lazy big screen cash-in,” is expected to take in as much as $30 million in total through Sunday.

The Leonardo DiCaprio-led “One Battle After Another,” which was No. 1 at the box office last Friday, dropped to second, with

See Full Page