The Phelps, who have been married since 2016, also share three other sons: Boomer, seven, Beckett, five, and four-year-old Maverick.
The couple announced they were expecting their fourth child in a sweet anniversary post shared in October 2023.
“Happy Anniversary to my best friend, hubby and partner thru life ❤️ I couldn’t have asked for anyone better!,” Nicole wrote at the time.
“For those that are wondering… yes! we’re expecting our 4th Phelps in 2024 💙💙💙💙.”