The model turned 24 on Sunday.
Justin shared a series of photos of his wife on Instagram, both of her all glammed up and dressed down at home.
"My eyes are 4 you. My heart is 4 you. My soul is 4 you. My love is 4 you. I am Home wherever you are. You are my safe place," he wrote.
"I am completely and utterly obsessed with who you are. My biggest dream is growing old with you. I can't believe you are mine forever," Justin concluded. "HAPPY BIRTHDAY BABY."
Justin's mom, Pattie Mallette, also wished Hailey a happy birthday.
"HAPPY BIRTHDAY @haileybieber !! I love you forever," she wrote on Instagram alongside a photo of them from Christmas. "You are a gift and a blessing to our family. So grateful you were born !! Love love love ❤️."
Justin and Hailey, who married at a New York City courthouse in September 2018, have worked hard on their relationship and marriage. In the singer's new YouTube originals documentary, Justin Bieber: Next Chapter, he opened up about how the pandemic brought him and Hailey closer.
"There's a lot more confidence in my relationships," Bieber said when told that he seems like his "best self right now."
"Tour's canceled and I had to adapt to that," he continued as scenes of him and Hailey flash on the screen. "It allowed us to take a step back and focus on each other. That was a beautiful thing. And that turned into working on an album."
See more in the video below.