The Jason Bourne actor and his stunning wife Luciana Barroso were spotted enjoying a family day out on the beach in Byron Bay with their three daughters Isabella, 12, Gia Zavala, 10 and Stella, 8.
Matt, 48, looked to be in high spirits as he chased his youngest child across the sand before breaking into a fit of laughter.
The Goodwill Hunting star was every inch the doting dad as he snapped sweet shots of his children with their arms round each other.
He kicked a football across the sand as 43-year-old Luciana watched on, showcasing her incredible physique in a strappy blue bikini.
Byron Bay has become something of a second home to Damon and his Argentinean interior designer wife, who he first met on the Miami set of Stuck on You in 2003.
The A-list couple rented a $4 million condo in the coastal town for four months in 2018, and often spend time at the home of Chris Hemsworth and Elsa Pataky who also live in the laid back area.
In an interview with Richard Wilkins on Channel 9's Today Extra last June, Hemsworth hinted the Damon family might be planning a permanent relocation to Australia.
"He's in love with this country," the Thor hunk said of his pal.