Jackie 'O' Henderson strips down to a bikini top and shows off her killer curves as she enjoys a dip at Clovelly Beach in Sydney

Jackie 'O' Henderson has undergone a dramatic weight loss transformation in the past year.

The radio titan chose to show off her new killer curves on Thursday when she visited Clovelly Beach in Sydney's eastern suburbs.

The 49-year-old looked fit in the seaside playground favored by influencers and former reality stars.

For her fun in the sun, Jackie wore a navy blue ensemble, which consisted of a low-cut bikini top with white trim that showed off her ample bust.

She completed the look with a modest skirt and wore a white knitted cardigan over it.

The petite blonde is accessorized with a pink bucket hat and black sandal-like flip-flops.

Jackie made sure all eyes were on her as she took off her cardigan, threw her headgear into the wind and stepped into the water for a refreshing dip.

She seemed to be enjoying her solo time as she paddled around in the ocean.

Jackie has lost a whopping 18kg in less than a year and recently revealed exactly how much she weighed before she decided to start her weight loss journey.

She made the confession on The Kyle And Jackie O Show after the radio program welcomed a caller who weighed 185 lbs.

Curious news anchor Brooklyn Ross turned to Jackie and asked her, “You know what the biggest thing is [you weighed] used to be?'

“The largest was 80,” she replied.

Jackie's confession comes after she once had to deny that Ozempic was behind her spectacular slimming.

Ozempic, an appetite suppressant previously used to treat type II diabetes, has seen an increase in prescriptions for obesity in recent years and is now used by many celebrities to maintain a slim figure.

Jackie has always maintained that she achieved her weight loss by participating in WW (Weight Watchers), for which she was an official ambassador.

But speculation revived after WW, led by CEO Sima Sistani, began embracing semaglutide drugs like Ozempic.

Reacting to the news about The Kyle and Jackie O Show, Jackie exclaimed, “Makes me feel like I was definitely on Ozempic!”

She jokingly added, “I was like a guinea pig in that experiment.”

News anchor Brooklyn Ross then asked Jackie if she was “annoyed” that she had to lose weight “the hard way” instead of just popping a semaglutide for a quick fix.

“I mean, they make a good point and I'm really impressed that they're moving with the times,” she said.

“You see so many people doing it and being successful, and for them it's not that hard.”