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

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

The journalist, sister of actress Nicole Kidman, cooled off with a dip in the ocean.

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

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

Antonia went makeup-free while swimming and wore her brunette bob around her face.

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

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

The journalist, sister of actress Nicole Kidman, cooled off with a dip in the ocean

The journalist, sister of actress Nicole Kidman, cooled off with a dip in the ocean

The journalist, sister of actress Nicole Kidman, cooled off with a dip in the ocean

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

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

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

She emerged from the waves relaxed and refreshed before drying herself 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 was married for eleven years, but separated in 2007.

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

Following their divorce, 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 design

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

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

Antonia went makeup-free while swimming and wore her brunette bob around her face

Antonia went makeup-free while swimming and wore her brunette bob around her face

Antonia went makeup-free while swimming and wore her brunette bob around her face

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

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

She emerged from the waves relaxed and refreshed before drying herself 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 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 was married for eleven years, but separated in 2007

The former couple was married for eleven years, but separated in 2007

The former couple was married for eleven years, but separated in 2007

Following their divorce, Antonia married Singapore-based businessman Craig Marran in April 2010

Following their divorce, Antonia married Singapore-based businessman Craig Marran in April 2010

Following their divorce, Antonia married Singapore-based businessman Craig Marran in April 2010

They had two children together: sons Nicholas, 12, and Alexander, 10, with Antonia welcoming 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 actually no secret. No matter how many kids you have, it's hard,” she told 9Honey about motherhood.

They had two children together: sons Nicholas, 12, and Alexander, 10, with Antonia welcoming her sixth child at the age of 42.

They had two children together: sons Nicholas, 12, and Alexander, 10, with Antonia welcoming her sixth child at the age of 42.

They had two children together: sons Nicholas, 12, and Alexander, 10, with Antonia welcoming her sixth child at the age of 42.