The reality couple will marry later this year and smitten Tyler couldn't help gushing via Instagram about how much he loved his wife-to-be.
In a touching post, he said: "I cant wait to make this beautiful woman my bride in 6 months. I'm the luckiest man in the world to have such an incredible god sent angel by my side.
"Catelynn, you will never know what a blessing you have been to my life, so it looks like I will be spending the rest of my days proving it to you as your husband."
He added the hashtags: "#MyBaby#StrongestWomanIKnow #PureAngel #BrideToBe
Tyler and Catelynn rose to fame on MTV series 16 & Pregnant, which documented Catelynn's pregnancy with their daughter Carly. Their story was followed in Teen Mom as they decided to give Carly up for adoption as it was in her best interests.
On New Year's Day this year, the couple welcomed daughter Novalee Reign.
Alongside another photo of himself and Catelynn, Tyler added: "I could kiss her all day! Sorry guys, its just one of those days where I could scream it from the rooftops about how much I love her! #NoShame #TheLoveOfMyLife #MiddleSchoolSweetHeart #MommaBear."
Earlier this month, both Catelynn and Tyler got tattoos in honour of Novalee. Catelynn chose to have an imprint of the baby's foot tattooed on her own foot, while Tyler had his daughter's name inked across his arm.
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