When it comes to undercover celebrity couples, Jeffrey Dean Morgan and Hilarie Burton's years-long relationship is almost unrivaled.

But perhaps that's why The Walking Dead star and One Tree Hill alum have defied the odds when it comes dating in Hollywood, as made evident by Hilarie's recent pregnancy announcement! The lovebirds, who secretly welcomed son Gus in 2010, have a little girl on the way and they couldn't be more overjoyed. 

Jeffrey is so excited, in fact, that he accidentally spilled the beans during an appearance at a Supernatural convention over the weekend. The actor then confessed on Instagram, writing, "After all these years [Hilarie's] come to expect me to be a dope... thank god she gets it, and loves me regardless."

Be still, our beating hearts!

In honor of Jeffrey and Hilarie's addition to their soon-to-be family of four, we're looking back at their extremely private relationship over the years.

From their first blind date with Jensen and Danneel Ackles, heartwarming soundbites about childhood and their decision to open a candy store in upstate New York, there's much to learn (and admire!) from this inseparable duo. 

Hilarie Burton, Jeffrey Dean Morgan

Jason Merritt/Getty Images

Hilarie Burton, Jeffrey Dean Morgan

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Hilarie Burton, Jeffrey Dean Morgan

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Hilarie Burton, Jeffrey Dean Morgan

Jim Spellman/WireImage

Hilarie Burton, Jeffrey Dean Morgan

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Hilarie Burton, Jeffrey Dean Morgan

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Hilarie Burton, Jeffrey Dean Morgan

Taylor Hill/FilmMagic

Hilarie Burton, Jeffrey Dean Morgan

Taylor Hill/Getty Images

Jeffrey Dean Morgan, Hilarie Burton, 2017 Golden Globes, Couples

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Hilarie Burton, Jeffrey Dean Morgan

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Hilarie Burton, Jeffrey Dean Morgan, 2017 Emmys, Couples

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Jeffrey Dean Morgan, Hilarie Burton, Kids

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Hilarie Burton, Jeffrey Dean Morgan

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Congratulations to the growing family!

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