Chip Gaines celebrates wedding anniversary by penning a sweet poem to wife Joanna

Happy anniversary, Chip and Joanna Gaines!

The Fixer Upper stars celebrated 15 years of marriage on Thursday, and in honor of their special day, Chip shared a sweet poem he wrote for his wife via Twitter.

"15 years.. where'd they go. 15 years.. I’d like to know," he wrote. "15 more, to God I pray. 15 more just to make her day. Happy anniversary sweet girl!"

Joanna followed suit, posting a stunning black-and-white shot from their wedding day to her own account.

"It's been a good fifteen years @chipgaines," she captioned it. "Here's to fifty more..."

Chip, 43, and Joanna, 40, tied the knot on May 31, 2003. They share four children -- Drake, 13, Ella, 11, Duke, 9, and Emmie Kay, 8 -- and are expecting their fifth child, a baby boy, this summer.

When ET caught up with Joanna last month in New York City, she gave us an update on how her pregnancy has been going, admitting she's been craving a lot of sugar lately.

"Anything a 5-year-old or younger would love is what I am craving right now, which is so weird!" she joked. "For Drake, [I craved] ice and lemons, so I always made Chip go to the gas station late at night to get the crunchy ice because we didn't have that in our fridge. With the boys, it was always something citrusy and right now, I am craving oranges and lemons. And then [with] the girls, [I wanted] salty. I normally don't crave citrus, but I have to have an orange every day now."

See more photos of Chip and Jo together:

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Chip Gaines and Joanna Gaines on Instagram
This is 40. And I like it... #pregnantandforty #anddoughnuts
I can't believe tonight marks our very last episode of Fixer Upper. This picture is of us filming our pilot in 2012 and then our last scene of fixer in 2017. What a journey this has been! Check out my blog to read an update from us and to see what's on the horizon for our family and Magnolia as we move forward. The end is bittersweet, but we are excited for what's to come. Tune in tonight for the series finale on HGTV @ 9/8c! #fixerupper (link in profile)
We can’t believe tonight’s the series finale of #FixerUpper. What a ride it’s been! I'll be sharing some blasts from the past today leading up to the final episode at 9/8c on HGTV.
I can't believe there are only TWO fixer uppers left?! I love tonight's episode!! See Chip's dream of owning a breakfast joint turn into a reality with this giant renovation. Watch tonight at 9/8c @hgtv #magnoliatable #fixerupper
What an amaizng weekend with the @timtebowfoundation ✨ Thank you for giving hope and love to so many #ttfgolf2018
Tonight's episode is another favorite of mine because it's a personal project here at the farm. I can't wait for you to see this beautiful reveal! #fixerupper 9/8c @hgtv ❤️
Tonight’s going to be a very special episode! We partnered with @timtebow and the @timtebowfoundation to help an amazing family here in Waco. You won’t want to miss it!! @hgtv 9/8 CT. #fixerupper | Photo courtesy of @HGTV
The restaurant is getting so close. Magnolia Table will be open soon and we can’t believe it?!? Chip + Jo=❤️
Gaines party of 7.. (If you’re still confused.. WE ARE PREGNANT) @joannagaines
This guy right here... I get to live life with him. I get to hear his thoughts and benefit from his wisdom and encouragement on a daily basis. The reason I am who I am today is because Chip pushed me to go for it. People think of him as a jokester, and he is. It’s a huge part of why I fell in love with him in the first place. But he is so much more than that. He is the ultimate cheerleader, coach and dream maker. I am so thrilled that his book releases today mostly because I believe it holds truth that the world is in desperate need of. I am always proud to be Chip’s wife but today more than ever. I know this book was a true labor of love. Well done, Chip Carter Gaines! #CapitalGaines @chipgaines
What a day!! #CapitalGaines #booktournyc @chipgaines
What a night ✨✨ #silobration
Today we got to take a walk down memory lane with the crew... remember this house?! This was the first home we shot for our #fixerupper pilot episode five years ago! My how time flies 📺
Thank you all for watching, caring and cheering us on these past few years. We are overwhelmed by your support and your kindness. You have become a part of our story forever. Season 5 of Fixer Upper is scheduled to start airing in November and we really have saved the best for last! (To see the full announcement about our finale season, visit magnoliamarket.com/blog)
Congratulations to my Chipstarter winners! Some may say 6 out of 2,700 is lucky.. around here we call that a miracle and I’m honored to be a small part of your story moving forward. Thank you to everyone who took the time to share your dream with me. Capital Gaines is officially out tomorrow, so go pick up a copy and keep working towards that dream of yours. #CapitalGaines (link to winning videos in my profile)
Jo has poured her heart and soul into this new line, Hearth & Hand with Magnolia available at Target November 5th. We're here with Bullseye at Target HQ today announcing it to all of their team members! I wrote down all my thoughts about this project on the blog—go check it out. #HearthAndHand (Link in profile)
@U2 tonight - I have a feeling this is going to be a good one. #U2TheJoshuaTree2017
Another #fixerupper reveal down today for Season five! @hgtv #season5iscoming
Was trying to make a video for a friend this morning with @chippergaines .... his tutorial was 👍🏽 #🤡
Once a design assistant, always a design assistant. I've got the best job in the world! #fixerupper #season5iscoming
I've got you babe! #season5iscoming #fixerupper 📹: @huntybuns
WHAT!?! 📸@brockwayne
Out on a hot date last night! @joannagaines loves to drive, so I usually let her.. but road trips, those are mine!
"We were together. I forget the rest." - Walt Whitman & @jimmydon522 Happy Valentine's Day @joannagaines
He competes with the view. Man bun, tube socks, adult onesie and all... He still looks mighty fine to me❤️#workcation #bookcamp
That was a fun date night ❤️@chippergaines @u2
Today started off with me holding one of our new baby goats and counting chickens... I knew it was going to be a good one. THANK YOU for all the kind words and birthday wishes ❤❤❤
Watch an all new #fixerupper tonight!! 9/8c @hgtv
Happpppy New Year!!! 2017!! #adultonesies @chippergaines
Tonight is an all new special episode! It's the season four Clip show- full of out takes, bloopers and behind the scenes footage. You won't want to miss! 9/8c @hgtv
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