Throwback Hollywood couples

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You never forget your first love.

In this case, however, we mean the first celebrity couple you fell for, the twosome that defined togetherness for you, the pair that was just a given in Hollywood, part of the foundation.

Until they weren't, that is.

Some matches simply weren't meant to last forever, no matter how serious they were at one point. Vows may have been said, children born, thousands of pictures taken, and yet none of that guarantees a happily ever after, any more than actually being each other's first love does. That's how it goes.

But even though one day you may wake up and two people who were married for 10 years have been divorced for 20, and that epic romance of yore is no longer the defining relationship of their lives, that doesn't mean it didn't leave a mark on our collective psyche, or otherwise shadow our view of that celeb's future love life.

Now, we don't usually advocate living in the past.

But Sept. 18 is National First Love Day, and in honor of this sacred holiday, we're going way back—not necessarily to a star's first-first love (though some do fit that bill), but to the first time their coupled life thoroughly registered in our collective consciousness.

Other loves may have come before, and have come and gone since, but here's where it all started, for us:

Bruce Willis, Demi Moore

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Alec Baldwin, Kim Basinger - Throwback Hollywood couples

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Melanie Griffith, Don Johnson- Throwback Hollywood couples

Kevin Winter/DMI/The LIFE Picture Collection via Getty Images

Nicole Kidman, Tom Cruise

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Hugh Grant, Elizabeth Hurley

Tim Rooke/REX/Shutterstock

Tim Robbins, Susan Sarandon - Throwback Hollywood couples

Ron Galella/Ron Galella Collection via Getty Images

Justin Bieber, Selena Gomez, Billboard Awards

Kevin Mazur/WireImage.com

Vanessa Hudgens, Zac Efron

Steve Granitz/WireImage.com

Geena Davis, Jeff Goldblum - Throwback Hollywood couples

Ron Galella/Ron Galella Collection via Getty Images

Michael Keaton, Courteney Cox - Throwback Hollywood couples

Steve Granitz/WireImage

Britney Spears, Justin Timberlake, 2002

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Sean Penn, Madonna - Throwback Hollywood couples

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Heidi Klum, Seal

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Ryan Phillippe, Reese Witherspoon

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Just remember, we're not crying because they're over—we're smiling because they happened.

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