Lively stars opposite Justin Baldoni, who also directed this first big-screen adaptation of a Colleen Hoover novel.

TheIt Ends With Uscast is bringing the romantic chemistry behind the camera, too.

On the red carpet for theIt Ends With Uspremiere, starBlake LivelytoldE!

Blake Lively at the “It Ends With Us” premiere.

Blake Lively at the “It Ends With Us” premiere.John Nacion/Variety via Getty

Newsthat husbandRyan Reynoldswrote the fan-favorite rooftop scene.

“The iconic rooftop scene, my husband actually wrote it,” Lively said.

“Nobody knows that, but you now.”

Baldoni also directed the film.

“He works on everything I do,” Lively told E!

“I work on everything he does.

So his wins, his celebrations are mine and mine are his.”

The power couple also lent their voices to this year’sJohn Krasinskidirected animated filmIF.

It Ends With Ushas already courted a bit of controversy, due to Baldoni and Lively’s ages.

Then we should be worried."

It was Hoover herself whoconvinced Baldonito take the part of Ryle after he’d boarded the project as director.

The two struck up an email penpal relationship after Baldoni was moved to tears reading the book.

Maybe Ryle, perhaps?

I think you could do it."

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As far as Reynolds is concerned, theFree Guystar is certainly known for his wit and comic timing.

You’ll have to be the judge whenIt Ends With Ushits theaters on August 9.