Donnalee Roberts, Ivan Botha (Photo: Gallo Images)
The star shared a photo of her newborn's feet, writing a beautiful message to him.
"My dearest beautiful baby boy, you came into this world with such a calm determination and forever changed it, may every step that you take on this beautiful journey called life be filled with the greatest most colourful adventures [sic]," Donnalee's message starts.
She goes on to share her many well wishes for her son, adding: "Becoming your mommy has literally changed my entire being, every cell in my body [sic]."
"Your beautiful daddy @ivanbotha17 and I are your biggest fans (you have the most amazing daddy in the whole world, he is literally my hero and one day when we tell you the story of the day that you came into this world you will know exactly why!!) he is my best friend and I just know he is going to be yours too [sic]."
In a post on his Instagram account, Ivan shared side-by-side photos of his daughter as a baby in 2009 and his newborn son.
"In 2009 God Romanced me in the most breathtaking way with the most beautiful girl. 11 years later he blessed me with this beautiful boy. It's a surreal moment becoming a parent on two, I could actually feel how my heart expanded. I never knew I could love this much. What a humble honour to be your Dad. I promise to always do my best. May both of your journeys be filled with God's love, joy, kindness, courage, compassion and adventures [sic]," he wrote.