"Happy First Mother's Day/Birthday !! As if it were even possible, when you became a mother, you became even more beautiful. You’ve brought more love and joy to my life than I ever imagined. Thank you from the luckiest guy on the planet. XOJS," he penned on the social media platform next to a pic of Caitlin with their newborn son, Billy.
And Caitlin had some sweet words to say back. "So much love for my boys, thank you for making me a mommy. I’m the luckiest birthday girl in the world to spend today with you two," the 32-year-old wrote alongside a photo of John cuddling their baby boy.
John and Caitlin previously announced they were expecting in December 2017 and then married in early February 2018. Baby Billy was then born in April 2018. "We just kind of crammed everything in because it’s been so great," John shared in a previous interview.
The 54-year-old also once noted he knows his late parents would have loved Caitlin. "I know my parents are smiling down," he told Entertainment Tonight. "I know they would love her. She's a gentle, kind, graceful soul who would be a good mother."
In fact, John has a lot of sweet and romantic things to say about his lady. "My whole life I’ve waited for this moment and the best part is I’m getting to parent with the most perfect woman. She’s just humble and sweet," he previously said. "I have to watch her because it takes her 30 seconds to win somebody over. She’s a really special person." You have us in tears, Uncle Jesse!