Fun in the sun! Naomi Watts enjoys a beach day with her brother Ben in Byron Bay after celebrating Christmas with sons Alexander and Samuel

She was very much the doting mother at Christmas, enjoying quality time with her sons Alexander, 10, and Samuel, nine.

And on Thursday, Naomi Watts was also seen spending time with her brother Ben Watts in Byron Bay, on the New South Wales coast.

A short clip shared to Ben's Instagram Story, saw the 49-year-old actress revealing her slender frame in a red one-piece and denim cut-off shorts.

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Fun in the sun! Naomi Watts enjoys a beach day with her brother Ben in Byron Bay after celebrating Christmas with sons Alexander and Samuel 

Fun in the sun! Naomi Watts enjoys a beach day with her brother Ben in Byron Bay after celebrating Christmas with sons Alexander and Samuel 

Ben, who earns a living as a photographer, appeared in high spirits as he filmed the candid clip that also saw his girlfriend, stylist Gabriela Langone, in attendance.

Sporting board shorts, a chunky necklace and gold-rimmed sunglasses, the larrikin lad directed at his fans enthusiastically: 'Yeah, we're Australia!' 

Looking good: A short clip shared to Ben's Instagram Story, saw the 49-year-old actress revealing her slender frame in a red one-piece and denim cut-off shorts 

Looking good: A short clip shared to Ben's Instagram Story, saw the 49-year-old actress revealing her slender frame in a red one-piece and denim cut-off shorts 

The outing comes just days after the King Kong star shared a festive picture with her two sons to her Instagram account. 

The image, shared to the site last Thursday, saw Naomi and Alexander and Samuel donning striped onesie pyjamas as they posed in front of a tree with their beloved pooch Bob.  

Naomi's onesie matched her eldest son's, while Samuel wore a bright red and white set.

In the caption Naomi wished her fans a Merry Christmas.

'Happy, happy holidays to everyone!' The outing comes just days after the King Kong star shared a festive picture with her two sons to her Instagram account

'Happy, happy holidays to everyone!' The outing comes just days after the King Kong star shared a festive picture with her two sons to her Instagram account

Back Down Under: Last Friday, Naomi returned to Australia for the holidays, flying into Brisbane airport with her two sons 

Back Down Under: Last Friday, Naomi returned to Australia for the holidays, flying into Brisbane airport with her two sons 

'HAPPY, HAPPY HOLIDAYS to everyone!! Wishing for a fantastic 2018,' Naomi wrote.

Last Friday, Naomi returned to Australia for the holidays, flying into Brisbane airport with her two sons.

The actress shares her children with her ex partner Liev Schreiber, 50, whom she split with in 2016 after 11 years together. 

Former couple: The actress shares her children with her ex partner Liev Schreiber, 50, whom she split with in 2016 after 11 years together

Former couple: The actress shares her children with her ex partner Liev Schreiber, 50, whom she split with in 2016 after 11 years together

Putting their kids first: Despite their breakup, the former couple have remained on friendly terms and are committed to co-parenting their two children 

Putting their kids first: Despite their breakup, the former couple have remained on friendly terms and are committed to co-parenting their two children 

Despite their breakup, the former couple have remained on friendly terms and are committed to co-parenting their two children.

'Routine is a big part of it,' she told the Australian Womens Weekly in August. 

'Obviously Liev and I are actors - there is some moving - but we've really tried to keep the boys in the same school. Give them structure, boundaries.' 

Naomi has since been romantically linked to her Gypsy co-star Billy Crudup while Liev is rumoured to be dating Miss South Dakota, Taylor Niesen, 26. 

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