Chip and Joanna Gaines Celebrate 18 Years of Marriage: 'Thankful to Be on This Adventure with You'

Chip and Joanna Gaines are celebrating nearly two decades of marriage!

On Tuesday, Joanna, 42, posted a slideshow of photos and videos with her husband in honor of their 18th wedding anniversary.

Set to the tune of "Mexico" by James Taylor, the footage included special and silly moments between the couple as they celebrated their milestone on a tropical vacation without kids Crew, 3, Emmie Kay, 11, Duke, 12, Ella, 14, and Drake, 16.

"18 years. Thankful to be on this adventure with you—happy anniversary @chipgaines ❤️," she captioned the Instagram post.

The Fixer Upper alums recently opened up to Oprah Winfrey for a Super Soul special during which they spoke about how they, as Oprah says, "bring the best to each other."

For Chip, 46, the answer is "perfectly clear." His wife has helped him calm him down and focus on what's important, he said.

"I was like a dog chasing his tail in a circle, trying to be all the things for all the people and I can just, beyond a shadow of a doubt, quickly say [Joanna] grounded me," he said. "And it's almost like the dog then saw the tennis ball or whatever and calmed down."

"I was just such an idiot and I was just so anxious and so excitable," Chip added.

RELATED VIDEO: Chip Gaines Says Wife Joanna 'Cried Her Eyes Out' When Son Drake Got His Driver's License

For Joanna, Chip has done a bit of the opposite for her and helped her to live in the moment and see the happiness in every day, outside of their routines and responsibilities.

"I'm more operational [and can] click into, like, a robotic mode and just show up and do the thing and forget the why a lot of the times — forget the joy," she explained to Oprah, 67. "To find the joy in that moment."

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"And Chip is always teaching me if you're not having fun, if you're not enjoying and savoring these moments, then why are you doing it?" Joanna added. "And he also pushes me to do it."