dakota johnson
Dakota Johnson has split from real-life boyfriend Matthew Hitt. Getty/Jason Merritt

Fifty Shades Of Grey star Dakota Johnson has reportedly split up with her boyfriend in the wake of the success of the movie.

According to US Weekly, the 25-year-old actress split from boyfriend Matthew Hitt, just as the erotic film had smashed box office records.

Johnson, who is the daughter of actress Melanie Griffith and Miami Vice actor Don Johnson, has shot to fame with the release of the film which has become a global phenomenon.

It has been speculated that her new found fame is a factor in the breakup.

A source told the publication: "Her life was getting too crazy and it wasn't something that he wanted to be a part of."

In an interview in Vogue in January, Johnson said the hype surrounding the release of the film has been overwhelming.

"It's just the most insane thing to be a part of," she explained. "I've never experienced anything like this; I don't think anyone has. It's terrifying—and it's exciting."

The actress has been on a whirlwind promotional tour for the film, which is an adaptation of the E.L. James novel. The demanding schedule has left little time for her to focus on her personal life.

The couple had been dating for about six months and were last photographed together in New York in December.

Wales born Hitt is the lead vocalist and guitarist for indie rock band Drowners which he formed after moving to New York in 2011.

He is also a model and has appeared in campaigns for Gucci, All Saints and Band Of Outsiders.

Johnson, who is a celebrity presenter at the Oscars on Sunday (February 22), arrived in Los Angeles on Thursday (February 19).