Blake Lively is speaking directly to fans of It Ends With Us . ET's Denny Directo exclusively spoke with the actress on Friday, and she revealed why fans of Collen Hoover 's beloved book should be eager for, not nervous about, the upcoming film adaptation she stars in alongside Justin Baldoni . "Some people will always like a book better than a movie and some people like a movie better than the book, but I think that we just did our best to honor the book and honor the fans, and, I think, really make something that works even by itself," Lively told ET at Book Bonanza, the book convention Hoover started with her sisters, Lin and Murphy.

"If you don't know the book, the movie works. I don't think there's any way that if you read the book and you saw the movie that you wouldn't be thrilled. We really worked hard on that," she added.

"I also believe if you saw the movie and then read the book, you wouldn't go, 'Hold on, this isn't like [the other].' You can do either. I think they're both really beautiful.

" Hoover agreed, telling ET, "Readers tend to always want to read the book first. I completely understand that, but I feel like this adaptation has stayed so true to the book that it's actually either or, whatever you prefer. I think that you'll be happy if you watch the movie and then go into the book or vice versa.

" The movie and the book follow Lily Bloom's (Lively) volatile relationship with Ryle Kincaid (Baldoni) amid the reappearance of her first love, Atlas Corrigan (Bra.