Fans who didn't like the poppy direction of Taylor Swift's 2012 album Red are not going to be pleased with her follow-up. According to sources, it seems as though Swift is going to continue her journey from country darling to bona fide pop star on her next effort, because she's working with notable hitmaker Max Martin.

According to a new story in this week's issue of Rolling Stone (via Popdust), Swift's label head Scott Borchetta admitted she's working with Martin on her fifth studio album, and that he worked on "most of" the effort and that it continues her pop transformation.

"Taylor fans are going to love it," said Borchetta. "Will country stations play a complete pop song because it's her? No. But when she comes to town, her friends at country radio will come and see her."

Swift has blurred the lines between country music and pop, ever since her debut album Taylor Swift in 2006, but her last effort Red featured songs such as "I Knew You Were Trouble" and "We Are Never Ever Getting Back Together," which peaked at No. 2 and No. 1 on the Billboard Hot 100, respectively, but they weren't exactly country music.

But now it seems like her pop transformation is complete.

A music writer for decades, Martin has worked with Swift before, on "We Are Never Ever Getting Back Together." He's best known, however, for helping to launch the careers of pop icons Backstreet Boys, Britney Spears and Katy Perry.

Concrete details about Swift's fifth album have yet to be revealed, but the album is expected some time in the next year or so, as Swift has already begun effort on the work. And regardless of her country status, she's a fan. In a recent interview, Swift said the record is her "favorite thing that I've ever created."

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