United Kingdom, Jan. 24 -- Charli XCX is "quite a volatile person".

The 33-year-old singer stars in The Moment, a new mockumentary directed and co-written by Aidan Zamiri that was inspired by Charli's real-life music tour, and she's now revealed how she relates to her on-screen character.

Speaking at the Sundance Film Festival, Charli shared: "I'm obviously quite related to my character, so I had a lot of inspiration to pull from.

"I would like to think I'm not as much of a nightmare as Charli in the film, but my real managers are in the audience and they probably know the true answer to that."

Charli observed that her on-screen character experiences some "spiral moments" in the movie. And the pop star compared and contrasted her real...