In an Instagram post, the "Dancing With the Stars" pro shared a throwback photo of a shirtless Chmerkovskiy at the gym from when their relationship first began.
"This was the first picture Maks sent me of himself back when our courtship started," Murgatroyd began. "In true Maks fashion he was very proud of his gym bod and I was of course head-over-heels in love (not at first sight, but close) haha."
She continued, "Our journey was perfect for us… A year long obsessive electric relationship that ended abruptly… that picked back up exactly where we left off when we both got our s--- together."
"What I want to say is that I'm grateful for it all, grateful for him in every way. I sit back and look at what we've built together and smile," Murgatroyd added. "My love, the love of my life, I wish you an abundance of joy, peace and light on your birthday. You deserve everything and more."
Murgatroyd and Chmerkovskiy tied the knot in 2017 and have a son, Shai Aleksander Chmerkovskiy.
Last week, Murgatroyd announced the she and Chmerkovskiy are expecting a second child.
"This news has brought extraordinary bliss to our family and we have so much to be grateful for," she said in an Instagram post.