Nicole Kidman39s statuesque sister Antonia shows off her slim figure

Nicole Kidman's statuesque sister Antonia shows off her slim figure in a mismatched bikini as the mother-of-six arrives on the beach in Sydney

Antonia Kidman enjoyed a sunny summer day on a Sydney beach this weekend.

The journalist, sister of actress Nicole Kidman, cooled off with a swim in the sea.

The 53-year-old showed off her slim and statuesque body in a mismatched bikini in shades of blue.

The swimwear consisted of a sporty top and high-cut bottoms with a tropical floral print.

Antonia went without makeup while swimming and wore her brunette bob on her face.

Antonia Kidman (pictured) enjoyed a sunny summer day on a Sydney beach this weekend

Antonia Kidman (pictured) enjoyed a sunny summer day on a Sydney beach this weekend

The journalist, sister of actress Nicole Kidman, cooled off with a swim in the sea

The journalist, sister of actress Nicole Kidman, cooled off with a swim in the sea

The 53-year-old showed off her slim and statuesque body in a mismatched bikini in shades of blue

The 53-year-old showed off her slim and statuesque body in a mismatched bikini in shades of blue

She emerged from the waves feeling relaxed and refreshed before drying off on the shore.

The mother of five shares four children with her late ex-husband Angus Hawley – Lucia, 26, Hamish, 23, James, 24, and Sybella, 16.

The former couple were married for 11 years but separated in 2007.

In April 2015, Angus died of a suspected heart attack in New York at the age of 46.

After their separation, Antonia married Singapore-based businessman Craig Marran in April 2010.

The swimwear consisted of a sporty top and high-cut bottoms with a tropical floral print

The swimwear consisted of a sporty top and high-cut bottoms with a tropical floral print

Antonia went without makeup while swimming and wore her brunette bob on her face

Antonia went without makeup while swimming and wore her brunette bob on her face

She emerged from the waves feeling relaxed and refreshed before drying off on the shore

She emerged from the waves feeling relaxed and refreshed before drying off on the shore

The mother of five shares four children with her late ex-husband Angus Hawley - Lucia, 26, Hamish, 23, James, 24, and Sybella, 16.

The mother of five shares four children with her late ex-husband Angus Hawley – Lucia, 26, Hamish, 23, James, 24, and Sybella, 16.

The former couple were married for 11 years but separated in 2007

The former couple were married for 11 years but separated in 2007

After their separation, Antonia married Singapore-based businessman Craig Marran in April 2010

After their separation, Antonia married Singapore-based businessman Craig Marran in April 2010

They had two children together: sons Nicholas (12) and Alexander (10). Antonia welcomed her sixth child at the age of 42.

Antonia and her family recently returned to Sydney after living in Singapore for almost a decade.

She said in 2017 that balancing six children with a busy career can be difficult.

“There's really no secret. No matter how many kids you have, it's difficult,” she told 9Honey of Motherhood.

They had two children together: sons Nicholas (12) and Alexander (10).  Antonia welcomed her sixth child at the age of 42

They had two children together: sons Nicholas (12) and Alexander (10). Antonia welcomed her sixth child at the age of 42