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The singer, 41, dedicated his beautiful performance at Thursday's Billboard Music Awards to his wife, 34.
In late September, Chrissy and John Legend made the heartbreaking announcement that they had lost their son - who they named Jack - after giving birth.
The former model made the emotional announcement on social media, revealing they were "shocked" and suffering "deep pain" at their loss, while sharing black and white teary photos from the delivery room.
Now, the Never Break singer has taken to Instagram to pay tribute to his wife further.
"This is for Chrissy," he wrote. "I love and cherish you and our family so much. We've experienced the highest highs and lowest lows together. Watching you carry our children has been so moving and humbling. I'm in awe of the strength you've shown through the most challenging moments.
"What an awesome gift it is to be able to bring life into the world. We've experienced the miracle, the power and joy of this gift, and now we've deeply felt its inherent fragility.
"I wrote this song because I have faith that as long as we walk this earth, we will hold each other's hands through every tear, through every up and down, through every test. We promised each other this on our wedding day seven years ago, and every challenge we've faced has made that promise more powerful, more resilient. Our love will remain. We will never break."
Legend went on to thank all the people who have sent the couple well wishes since their loss.
"We feel and appreciate your love and support more than you know. More than anything, we've heard so many stories about how so many other families have experienced this pain, often suffering in silence.
"It's a club no one wants to be a part of, but it's comforting to know we're not alone. I'm sure Chrissy will have much more to say about this when she's ready. But just know we're grateful and we're sending love to all of you and your families."
Chrissy previously told fans she had been taken to hospital after experiencing excessive bleeding during her pregnancy, telling them she was scared, but remained hopeful.
However, the Twitter favourite later confirmed she had lost the baby in a statement, writing: "We are shocked and in the kind of deep pain you only hear about, the kind of pain we've never felt before.
"We were never able to stop the bleeding and give our baby the fluids he needed, despite bags and bags of blood transfusions. It just wasn't enough."
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