Model who has had three surgeries to go up a whopping 18 bra sizes wants to go even bigger

Her claim to fame is having Australia's biggest fake boobs but this chest-obsessed woman wants to ignore medical advice and go under the knife again.

Sarah Marie Summer from Sydney has already had three boob jobs taking her from an 8A to an enormous 8M.

But the 23-year-old hasn't ruled out going even bigger after her assets have earned her multiple modeling jobs and a huge following on social media. #MORE pics below:

'I don't think people believe that this is actually how I want to look,' Sarah Marie told Woman's Day.

'I want to look silly and I want to be huge.

'They make people smile and that makes me happy, so that can't be a bad thing.'

Ms Summer underwent her first boob job in New Zealand when she was just 17.

It cost $13,000 and took her to a size 10C but the model wasn't 100 percent satisfied and started saving for her next procedure. 

In July last year, Ms Summer had her second breast augmentation and went up to a 10DD.

'I had mixed feelings after because they were still not what I had imagined. They were just not big enough so I decided to go again,' she said.

But even though the breast enlargements give her severe back pain and impact on daily life, Ms Summer maintains she's the happiest she has ever been.

'Driving is hard. I had to learn how to dance again and I often knock things over with them, or knock my drinks and spill it all over them,' Ms Summer said.