Though he's only a few days old, we can already tell little baby Max is going to be a cutie just like his siblings.
Alex and wife Bonnie share two older kids, twins Audrey and Evie who must be so excited by their baby brother's arrival on Sunday.
The sports presenter shared the news of Max's arrival on Monday, posting a series of photos from the hours after his birth on social media.
"We couldn't be happier. Our healthy, happy little boy came into the world at 1.08 on Sunday morning weighing 3.7 kilograms," he wrote at the time.
"After 41 and a half weeks it was well and truly worth the wait!"
Alex teased fans by choosing not to reveal his third child's name right away, though it's unclear if he just wanted to keep it private for a day, or if he and Bonnie simply hadn't settled on one yet.
"Name TBC and can't wait for his big twin sisters Audrey and Evie to meet him, boss him and shower him with cuddles," Alex wrote on Monday.
"I marvel at Bonnie's strength especially in these very trying times. Just amazing. Mum and baby Cullen recovering well."
Meanwhile, Bonnie shared her own snaps on Instagram, writing: "Look who's finally arrived! Welcome to our beautiful baby boy.
"Can't wait to introduce him to our girls. Three under three - fun times ahead," she wrote alongside laughing and love heart emojis.
She and Alex will have their work cut out for them, but the proud parents couldn't look happier with their latest addition to the family.
Twins Audrey and Evie arrived in January 2020, meaning they're close in age with their new baby brother and will hopefully have a strong bond with him growing up.
This story originally appeared on our sister site, Now to Love.