The couple announced another baby was on the way on September 8, sharing a series of nude maternity photos which showed off her bulging baby bump.
“Lucky number 3 💗 #16weeks 👶🏽,” she captioned the shots, the first of which was reposted by her husband, 36.
Speaking about her pregnancy in an interview with Mother Muse, the mum-of-three said: "My first was a breeze. I worked through it and worked out through it. I had no morning sickness, issues or complications.
"The second, I was deathly ill, lost my vision and feeling in my hands at times, couldn't work out or take my prenatals, had severe morning sickness.
I went to the ER three times and I was diagnosed with migraines during this pregnancy, and the third has been the easiest emotionally out of all of them, but I was diagnosed with hyperthyroidism, which I cured myself of naturally after a few months. Each one comes with a new type of struggle and lesson," the Australian born model concluded.
Nicole gave birth to her first child Zion in January 2015, with the couple marrying a year later in front of a small group of family and friends. They said "I do" in a stunning ceremony at the Colony Palms Hotell in Palm Springs, California.
Aussie models Jessica Gomes and Gemma Ward attended their big day. Other guests at the ceremony included supermodel Alyssa Miller, supermodel sisters Jessica and Ashley Hart, and musician Leon Bridges.
They went on to welcome their second child Gia, a.k.a. “Gigi” in 2018.
"Gia is named after my late father, Giuseppe Antonio Trunfio, who passed away from cancer," she told PEOPLE after announcing another baby was on the way.