While the new mum is expectedly exhausted, Grant, who also shares twins Jagger and Charlize with his ex-wife Candice Alley, said they are both doing well and are looking forward to taking their bub home later this week.
"Everything went very well with no complications. Sharlene is a bit tired but completely overjoyed with love. Her heart is even more full."
Grant— who began dating Sharlene in August 2018— revealed he was going to be a dad again in July, sharing ultrasound images of their baby boy to Instagram with the caption: "Can’t wait for our little man to arrive in January.”
"I felt I was going to hit 40 and I wanted another opportunity as a dad," he also told The Sunday Telegraph. "The trouble with being divorced is you're a father part-time. I hate that. I knew I wanted more children but only with a committed person who was going to be a life partner."
Three months after their whirlwind romance became far more serious, the former athlete popped the question.
“So happy to call this beautiful, supportive soul my fiancee. Life has certainly had its moments where your spirit is tested to its full will. However, I have to say, sharing and creating life with @sharlenefletcher_ has brought so much happiness and fun," he captioned the Instagram announcement.