Blake Lively talks bringing 'It Ends With Us' to screen

Serving fans of Colleen Hoover's best-selling novel It Ends With Us was at the heart of bringing the book to the big screen, actor Blake Lively says. At the London premiere of the romantic drama on Thursday, Lively said that turning the novel into a film, was "a great responsibility, but also an opportunity."

"When you have to service a group of people who are so passionate about the source material ... to be able to serve people who care so much, is beautiful," the actor said. In the movie, Lively plays Lily Bloom, a Boston-based florist who falls for handsome neurosurgeon Ryle Kincaid, portrayed by Justin Baldoni, who also directed the film.

As their relationship gets more serious, Ryle starts showing traits reminiscent of Lily's father's abusive behaviour, triggering her childhood trauma and forcing Lily to make tough decisions about her future to break a toxic pattern.

Lively, who made her directorial debut with Taylor Swift's I Bet You Think About Me (Taylor's Version) music video, received her first producer credit on It Ends With Us.

"I used to feel like an impostor because I would watch actors who were just shapeshifters. And then I realised that half of the actors that I admire most are people who had to get their hands in the storytelling, the writing and the creating and I was like, oh, okay, there's two different categories and I'm in this category, and that's okay," she said.

"Once I started embracing that and leaning into it and not feeling embarrassed about it, I think I was able to do the best work. And so that's why I'm so proud of this film," she said. It Ends With Us began its global cinematic rollout on August 7 and is out in US and UK theatres on August 9.