A RIPPED Aussie fitness star has hit back at vile trolls who accused her of sharing an over "sexualised" picture with her son.

Sophie Guidolin shared several snaps of son Kai in celebration of his 15th birthday on her Instagram page.

The post, captioned "Happy 15th Kay", included photos from when he was a baby and others from his teenage years.

But the picture that sparked a backlash was one of the 33-year-old giving her lad a big hug as she wears a green leopard print bikini.

The mum-of-four – an Instagram sensation with more than 560,000 followers – was forced to edit the post after some of her followers had a "problem" with it.

The Queensland influencer and nutritionist said how trolls had flooded her inbox with horrible comments about the picture.

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But fuming Sophie was having none of it as she took to Instagram to launch a full throated defence of her actions.

She hammered: "Sexy posing? I’m hugging my son for f**k’s sake!

"We live in The Gold Coast, Australia where wearing a bikini to the beach is so beyond normal, that I didn’t even consider having to place a disclaimer on this photo."

The star explained how she had been in her bikini while taking a dip in the pool when her son woke up – she ran over for a birthday snap.

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Kai didn't want to hang around because he was so keen to get on his new bike that Sophie had given him, so a quick picture had to suffice.

The furious mum added: “Do I have a problem wearing a bikini in front of my sons? NO WAY. Why? Because I’m not sexualised to him, nor have I ever been.

“If you have an issue, maybe you should look into why you feel you have to sexualise a woman’s body instead of it simply being a mum and her son at the pool!”

Some of Sophie’s followers commented how shocked they were that people had an issue with her photo.

One noted: “It’s gross that people even think that way‍️. You’re literally a mum taking a photo with her son on his birthday.

It's not shameful and it’s something I really, really reiterate and drive home here with my boys

"I can’t believe people even want to sexualise that.”

Others were shocked she had to explain herself.

Another user added: “How sad you have to explain yourself for god sakes people it’s SKIN we all have it, she’s not naked.”

Sophie went further as she tried to clamp down on the accusations of the "sexualised" photo as she highlighted the importance of seeing bodies as "normal".

She concluded: "It's not shameful and it’s something I really, really reiterate and drive home here with my boys.

"They don’t see me and be like, ‘Oooo what a sexy bum you’ve got.’ So stop sexualising bodies and bodies will stop being sexualised.”

Sophie set up The Bod – a nutrition and fitness company – after being diagnosed with gestational diabetes before the birth of her first child.

The then nineteen-year-old was forced to “actively start to learn about nutrition and what goes into my body”.

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