Phoebe Burgess and her NRL star husband Sam Burgess announce the birth of their baby son  

Phoebe Burgess welcomed her second child with NRL star husband Sam Burgess on Sunday. 

And on Tuesday, the delighted new parents took to Instagram to share their joy and show off their new addition. 

Alongside a black and white photo of the new mum and her proud husband cradling their son, William, in a hospital bed. 

Phoebe captioned the photograph:  ‘William “Billy” Mark Burgess. Born 9th December 2018, 4.22kg’. 

She added warmly: ‘Welcome to our world little big man, our hearts are so full.’ 

In the photograph, little William appears to be breastfeeding as a delighted Phoebe beams down at him. 

Kicking goals! Sydney couple Sam (left) and Phoebe (right), who tied the knot in December 2015, share 18-month-old daughter Poppy Alice (pictured middle)

Beside her, Sam looks serene as he takes the moving selfie of the pair, laying beside his blissful wife. 

It’s the second child for the pair, who share 18-month-old daughter Poppy Alice. 

Sam and Phoebe tied the knot in December 2015. 

Growing: In recent weeks, Phoebe has shared a series of social media snaps showing off her enormous baby bump 

In recent weeks, Phoebe has shared a series of social media snaps showing off her enormous baby bump. 

At 38 weeks pregnant she captioned one picture: ‘The bassinet is in, time to move out, little man!’