The 44-year-old HGTV star marked the occasion Tuesday by posting a tribute to Deschanel on Instagram.
Scott shared a video featuring moments from throughout his relationship with Deschanel, calling her "the woman who keeps me smiling."
"You just keep getting even better," he captioned the post. "Happy Birthday Zooey."
Deschanel reacted in the comments, writing, "I'm the luckiest girl!"
Jonathan Scott posted a tribute to his girlfriend, Zooey Deschanel, on her birthday. Photo via jonathanscott/Instagram
In a post on her own account, Deschanel asked people to celebrate her birthday by doing something nice for someone else.
"Hi! It's my birthday and so I would love to ask, as a birthday wish, for everyone to do something nice for somebody else. A friend or a stranger, doesn't matter.
FOLLOW REALITY TV WORLD ON THE ALL-NEW GOOGLE NEWS!
Reality TV World is now available on the all-new Google News app and website. Click here to visit our Google News page, and then click FOLLOW to add us as a news source!
"Give a compliment, open a door for someone, call someone you haven't talked to in a long time ... etc.," she wrote. "If you feel like it let me know what your good deed was in the comments. Thank you so much! I am so grateful for all of your kindness."
Scott and Deschanel were first linked in September 2019 and made their relationship Instagram official that October.
Deschanel had nothing but praise for Scott while celebrating their first anniversary as a couple in August 2020.
"One year ago today I met this kind, caring, hilarious, generous, creative, nerdy, handsome and all around incredible human," she said of Scott.
"I am so grateful for every smile, kiss, hug, snuggle, laugh, scrabble game, escape room, breakfast, lunch and dinner we share together. Even during the weirdest year for humanity, I want a million billion more with you."
Copyright 2023 United Press International, Inc. (UPI). Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.