It wasn't over, it still isn't over.

15 years later, we're all still swooning over The Notebook.

Released on June 25, 2004, the romantic drama became an instant classic, turning Ryan Gosling into, well, Ryan Gosling, and making Rachel McAdams a star. 

Based on the 1996 novel of the same name, The Notebook was the first of Nicholas Sparks' books to be adapted into his first major motion picture, kicking off an era of love stories designed to make us cry. But none could ever quite match the magic that was the decades-spanning love story of Noah Calhoun (Gosling) and Allie Hamilton (McAdams). 

But did you know that the movie (and celebrity couple history) almost looked completely different, with Britney Spears reading opposite Gosling for the role of Allie before McAdams auditioned, almost depriving the world of that blissful moment in time in the late-aughts when Gosling and McAdams were the IT celebrity couple? (Ah, McGosling will always have a special place in our hearts.)

While their palpable on-screen chemistry is largely credited for the movie's success—becoming a surprise sleeper hit in the summer of 2014, grossing over $115 million worldwide—things weren't quite so romantic behind-the-scenes, as Gosling, then 23, and McAdams, 25 at the time of filming, actually couldn't stand each other, with one actually trying to get the other star replaced at one point. 

And yet...like Noah and Allie...."they didn't agree on much. In fact, they didn't agree on anything. They fought all the time and challenged each other ever day. But despite their differences, they had one important thing in common. They were crazy about each other."

In honor of The Notebook's 15th anniversary, let's look back on all the behind-the-scenes secrets you might not know about the iconic movie...

The Notebook, Book Cover

New Line Cinema

Ryan Gosling, Rachel McAdams

Frederick M. Brown/Getty Images

Ryan Gosling, Britney Spears

Getty Images

ESC: Jessica Biel

Christopher Polk/NBC/NBCU Photo Bank via Getty Images

Rachel McAdams, Ryan Gosling

Ray Mickshaw/WireImage for New Line Cinema

Ryan Gosling, Rachel McAdams, 2005 MTV Movie Awards, Best Kiss

KMazur/WireImage

The Notebook, Rachel McAdams, Ryan Gosling

New Line Cinema

The Notebook, James Garner, Gena Rowland

New Line Cinema

The Notebook, James Garner, Gena Rowland

New Line Cinema

The Notebook, Ryan Gosling

New Line Cinema

The Notebook, Rachel McAdams, Ryan Gosling

New Line Cinema

The Notebook, Rachel McAdams, Ryan Gosling

New Line Cinema

The Notebook, Rachel McAdams, Ryan Gosling

New Line Cinema

The Notebook, James Marsden

New Line Cinema

The Notebook, Rachel McAdams, Ryan Gosling

New Line Cinema

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