The couple, who are already parents to two children – Daibhí and Éala - revealed the newest addition to their family will be arriving in early 2025.
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Mullan, who was crowned the 2023 winner of Dancing with the Stars, shared the happy news in an adorable post on Instagram featuring the family's dog, Angie.
"We are so incredibly over the moon to let you all know that we're expecting baby number 3, and Daibhí and Éala will be getting a new brother/sister in early 2025," he wrote. "We cannot wait….bring on even more madness."
He added: "Angie is buzzing with the news too as you can see."
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"I often talk to people about the mourning of the loss of your old life," he said. "That’s probably the biggest thing I’ve had to try and figure out. You realise, oh, it’s gone. It is not coming back, I keep thinking it’s coming back – it’s not."