Sam Mac and Fiancée Welcome Adorable Baby Boy!

 has added to his growing brood by welcoming baby number three with fiancée Rebecca James. 

The Sunrise weatherman took to Instagram on Friday morning to reveal the news alongside an image of the proud parents with their newest bundle of joy. 

In the picture, Sam and Rebecca look pleased as punch as they pose with their little man who is wrapped in a beige patterned blanket. 

'It’s a boy! Welcome to the world,' Sam wrote beside the image.

The star then introduced his son as 'Miles Samuel McMillan' before thanking his ladylove.

'Bec was an absolute superstar. Again. She’s recovering well. What a woman,' he added. 

'So excited for this little man to meet his big sisters Margot & Mabel. We now have 3 under 4. Wowsers,' he continued. 

It wasn't long before the announcement was inundated with well wishes.

'Incredible you guys. The best little man!' wrote Dr .

'Fabulous news! What a gorgeous family,' added Olympian Liesel Jones.

'Wonderful Sam, lots of love xx,' commented the ABC's Leigh Sales.

Even The Wiggles had something to say about it, writing, 'Such joyous news! Congrats'. 

Sam announced the couple was expecting their third child earlier this year and shared featuring his partner and the couple's two adorable children, Margot and Mabel.

Rebecca revealed her baby bump, which Sam kissed as he held a set of sonogram images.

Meanwhile, Rebecca held on tight to little Mabel while sporting a joyous expression, as Margot clutched a cookie and watched on.