Melissa George has shared a rare photo of her newborn son after giving birth to her third child at age 47.

The Home and Away actress posted to her Instagram Stories on Sunday, giving fans a rare look into her life with her baby boy.

The photo showed her baby son's adorable white outfit and long grey socks as he sat on her lap.

'Knee high sock Sunday,' she simply captioned the post.

Melissa shared the news that she had given birth to a third boy on March 20.

Melissa George has shared a rare photo or her newborn son after giving birth to her third child at age 47

The photo showed her baby son's adorable white outfit and long grey socks as he sat on her lap

She announced the news on social media with a black and white photo of the new arrival's feet.

'Welcome to the world my little man,' began the 30 Days of Night actress' caption.

'Love knows no end. A mother of 3 sons. Cannot believe it. My heart is so full.'

The baby's name is not yet known. Nor is the identity of the father.

The Perth-born star shocked her social media followers in January when she confirmed she was pregnant with her third child.

She held a fun blue-themed baby shower in March and at that time revealed she was expecting a baby boy.

Melissa shared the news that she had given birth to a third boy on March 20

Melissa shares sons, Raphaël, nine, and Solal, seven, with her ex-partner Jean-David Blanc, a French entrepreneur.

Due to a custody arrangement, Melissa's two elder sons can't leave France with their mother without their father's consent, which means she is now based in Paris.

Notoriously private Melissa hasn't revealed if she is in a relationship or who the father of her newborn is.

She was previously married to Chilean furniture designer and film director Claudio Dabed from 2000 to 2011.

The Perth-born star shocked her social media followers in January when she confirmed she was pregnant with her third child

READ MORE: Melissa George shares first look at her newborn baby boy after welcoming child number three at age 47