“Watching you evolve into the partner, friend, son, and father you are today has been so fulfilling,” she wrote. “My real life bestie & hubby all wrapped into one. I love you and I’m so so proud of you. happy happy birthday.”
Along with the sweet message, Jenner posted a series of photos of the couple, including a few with their 14-month-old daughter Stormi — and it’s clear the star has babies on the brain.
She concluded her message to Scott on a not-so-cyptic note, writing: “Let’s f— around and have another baby.”
WATCH BELOW: This how Kylie kicked off Travis' birthday celebrations... DAYS AGO.
Jenner has spent the last week showering Scott with plenty of birthday love.
Over the weekend, the makeup mogul appeared to buy out a billboard in Los Angeles to celebrate his special day.
The billboard, first spotted by fans this weekend and located in the West Hollywood, features a giant portrait of Stormi, alongside a sweet photo of Jenner, 21, and their baby girl.
“Happy birthday daddy,” the billboard reads. “Love, Mommy & Stormi xo.”
The billboard came days after Jenner and Stormi, alongside several members of the Kardashian and Jenner family, celebrated Scott during an Avengers-themed party.
At last Thursday’s celebration, held at Cinepolis in Westlake Village, California, Jenner surprised her boyfriend with a personalized cake, which included miniature figurines of Scott, Jenner and Stormi dressed up in superhero costumes. While the whole party was held in Scott’s honour, the sweet message that was printed atop the cake was perhaps the most telling about how deeply Jenner feels for him.
“HAPPY BIRTHDAY HUSBAND!” was printed in capital letters, as captured in big sister Kim Kardashian West‘s Instagram Story.