'Fixer Upper' star Chip Gaines shares sweet message on wife Joanna's birthday

And just when you thought they couldn't get any cuter ...

Chip Gaines wished his wife, Joanna, a happy 39th birthday on Wednesday with an adorable outpouring of his love on Instagram.

The HGTV star posted a sweet solo snapshot of his ladylove with a note that will make you tear up just a little bit:

"Jo, you are the best at everything you do. Watching you do your thing is one of my greatest joys. You are fascinating in every way, and like the rest of the world... I can't wait to see what's next. Happy birthday, young lady! -me"

Who knew Chip was such a pro at writing love letters? Men, definitely take notes ...

In the picture, the interior designer is wearing jeans and a green khaki shirt while her raven tresses are down and wavy. Jo looks totally gorgeous in the photo as she flashes a big smile -- we can see why Chip instantly fell in love with her from the moment he saw her!

The "Fixer Upper" pair has had a phenomenal year so far, with the fourth season of their hit HGTV show being the best yet! When their not filming or managing their businesses (which includes Magnolia Reality and Magnolia Market), they're busy taking on outside projects.

Joanna just recently dabbled in the fashion industry, launching a collection for Matilda Jane, which features girls' clothes, accessories and more.

She also recently partnered with rug company Loloi to create a stunning collection that you'll definitely want in your home!

Most importantly, the couple just announced a "Fixer Upper" spinoff in the works so that means you'll be seeing more of Chip and Jo on your TV -- we're definitely onboard for this!

RELATED: Take a look inside Chip and Jo's Pinterest-perfect home: