The Aussie musician, 27, and former talent manager, 33, previously took to Instagram in June 2023 to announce they were expecting their first child together.
The couple shared the announcement alongside a sweet picture of themselves kissing as they cradled Crystal's growing baby bump, while the mum-to-be was holding up a series of sonogram photos.
"You’re already everything," Michael captioned the picture. "Baby clifford 11/11/23."
"I'm filled with excitement and also with nerves," Michael told People shortly after the exciting news broke.
"I've been a dog dad for a long time, so I think I'm ready for a small human to take care of and communicate with conversationally after eight years of one-sided dog convos!"
"I have never been this happy in my entire life," Crystal added. "I'd like to think it's the baby's good vibes and energy radiating through me, but it's probably just the hormones."
The couple also reflected on an earlier health scare during the interview, with Crystal sharing that she had experienced a small complication at the beginning of the pregnancy; a subchronic hematoma.
"It caused a lot of bleeding, which was absolutely terrifying. We raced to the doctor on Easter when it happened, but thankfully our baby was okay."
Michael proposed to his longtime girlfriend in January 2019, on their third anniversary.
"I was lucky enough to ask the love of my life to marry me in the place it all began for us," he wrote on Instagram. "In the last 3 years she has helped evolve and shape who I am in ways I could never have imagined. I couldn't ask for anyone better to spend the rest of my life with. I love loving you, Crystal."
In January 2021, the couple announced that they had tied the knot during a secret ceremony the year prior. According to People, the couple originally planned to get married in Bali, however, they instead signed the papers at home with their wedding party in attendance.