Playboy model Simone Holtznagel strips naked for ‘Free The Nipple’ campaign during X-rated girls’ night out

SHE'S no stranger to scantily-clad photo shoots - but Playboy model Simone Holtznagel has become the latest star to bare all in the name of equality.

Stunning Simone posted a saucy snap on her Instagram with the hashtag #freethenipple, lending her backing to the campaign for women's nipples to be allowed on the photo sharing site.

The gorgeous Aussie model was pictured in the buff wearing thick-rimmed glasses and with her blonde hair tied up after a "girls night out got out of hand".

The 23-year-old posted the pic on her Instagram page just days after fellow Aussie model Imogen Anthony posed with a flame next to her boob to protest the nudity ban.

Simone wrote: "When girls night got out of hand and I was so pale I almost blended into the white 🌝 this picture does not do my pale-ness justice 🌝 📸@hannah_glasby lol #freethenipple"

The global campaign was launched in 2012 calling for female nudity to be treated the same way as male.

Men's nipples are allowed to be pictured on the photo-sharing site, while women's are censored.

In the US, most states class exposure of women's nipples as a criminal offence, but in the UK anyone is allowed to strip off in public as long as it is not to cause distress, alarm or outrage.

In June, hundreds of men and women staged a protest on Brighton beach to ‘Free The Nipple’ – by stripping.