“How lucky Elijah and I are to call Carson’s loved ones our own and how loved baby J already is. A day with family and friends celebrating such a magical time," she captioned a series of photos from the event.
"To our family and friends, thank you for welcoming me with the most open arms right from the very beginning.”
Alex also gave a shout out to her friend Jade Van Malsem who helped plan the special day.
“Thank you so much for going above and beyond making yesterday so very pretty and spesh.”
The former Bachelor and Bachelor in Paradise star shared photos of a bespoke cake adorned with native flowers, dozens of cupcakes and personalised cookies for guests.
Alex and Carson shared a tender moment in front of a balloon wall, both kissing soon-to-be big brother Elijah.
Alex announced the exciting news of her pregnancy on Instagram back in January via a black and white picture of her baby bump, writing, "I wonder if you’ll have your Father’s eyes? Will you be stubborn like your Mother? See you soon little darling ✨".
The soon-to-be mother-of-two first hit our screens on season four of The Bachelor, winning Richie Strahan's heart. The couple dated for a year before eventually calling it quits.
However, they soon met again on the second season of Bachelor In Paradise. After the show had aired, Alex claimed that she was tricked into the stint by producers.
While in paradise, Alex struck up a short fling with Australia's next Bachelorette Brooke Blurton. While sparks flew on screen, Brooke has since revealed that there was a lack of authenticity that we weren't privy to.
"That part with Alex, I just think she never really was genuine with her feelings and I could really read through that. I just don’t really value people in my life like that," Brooke told Who back in 2019.
"There's no bad blood, but I am all about people who bring value into your life and I just feel like I had to let that part of my life with Alex go."