Kyle Sandilands' wife Tegan Kynaston flashes her toned abs as she steps out with four-year-old son Otto at the radio star's meet-and-greet in Strathfield

Tegan Kynaston made a rare appearance in front of a crowd of fans on Saturday as she stepped out at her husband Kyle Sandilands' meet-and-greet event.

The radio star, 55, hosted a Kyle Sandilands Live subscribers event at Gould Street in Strathfield South, posing for photos with fans at AIIMS Creator Hub.

During the event, his wife Tegan, 40, arrived with their four-year-old son Otto, flashing her abs in a cropped T-shirt, as seen in clips shared to Instagram.

She paired the white baby tee with faded blue jeans that sat high on her waist. 

Holding the hand of her only child, Tegan also carried a black designer handbag as she greeted attendees at the event.  

Tegan was then seen walking into the studio with Otto, before letting the tot run to his father Kyle, who crouched down to hoist him in the air.

Elsewhere in the clips, Kyle could be seen interacting with fans and taking photos with them. 

His mother Pam was also in attendance at the event, along with the Kyle Sandilands Live crew members.  

Kyle first announced the meet-and-greet late last month, sharing a photo of himself posing with his Kyle Sandilands Live crew. 

'Kyle wants to meet as many fans as possible to celebrate the launch of his new show and personally thank you all for the love and support which really helped him get through the last few months,' the caption next to the photo read.

'Come down from 10AM to 2PM on Saturday, September 12 and line up to meet Kyle and then hang out with the team, grab some merch and mix with the community.'

The caption went on to say that only people who subscribed to Kyle Sandilands Live were allowed to attend, but they were allowed to bring their children, partners, or a plus one.  

It comes after Kyle revealed the brain aneurysm he was diagnosed with last year has grown.

The veteran presenter shared the news on his Kyle Sandilands Live subscription show, revealing he had taken some time off work to get a medical checkup – and the results were not what he hoped for.

'So, today's the day I've been dreading. Well, it's grown a little bit, which isn't great news,' Kyle said in a live-feed from the local clinic.

He later told listeners he was taking time to process the doctor's update that the aneurysm had grown by a further millimetre.

Kyle said: '[It] seems small, but I didn't want to get that, wasn't the thing I wanted to hear.

'I was hoping – and in my mind, I thought, 'I've got this, I'm gonna make it smaller,' but it was bigger.'

Kyle finished by saying the doctors were not yet prepared to try surgically removing it, as that was more risky than leaving it be.

'A life of bad choices has probably led me here. I'm full of regret. I do not want to die and I do not want to be carved up,' he said.

Kyle first went public with his health condition in February last year, revealing the aneurysm was four millimetres in size, with it growing by 25 per cent over the past year and a half.

At the time, Kyle shocked listeners when he revealed he required immediate surgery after doctors detected one aneurysm on his brain and a second one in his chest.

In January, he said the outlook was good, telling the Daily Telegraph that the aneurysms had stabilised.

'They re-looked at all those scans and said it's good,' he said.

'It's good because when they first found it they weren't sure whether I had it for 30 years or 30 days.'

He went on to say the chance of complications with surgery on his brain aneurysm is high, adding that doctors would have to 'cut his face off'.