But the age-defying single mum-of-four and grandma-of-one said the snapshots are more empowering than sexual – and insisted that she kept things 'classy and tasteful'.
The Instagram sensation, who plans to donate part of her calendar earnings to charity, said: “The idea is ‘sexy but not sexual’.
“I may be pretty much naked in some shots, but I’ve kept everything classy and tasteful.
“It’s not just about ‘she’s topless’ or whatever – there’s a stronger message about what I’ve been through in my life.
“I want to promote body positivity and help women to reclaim a sense of freedom about their bodies.
“Being naked is part of being a woman and embracing self-love and acceptance, which has taken me a long time to do.”
Gina, who is often mistaken for women half her age, grabbed headlines earlier this year by knocking scores of younger women out of the running for the coveted ‘Miss Maxim’ crown.
The glamour model reached the semi-finals of the modelling contest, being placed twelfth overall from a staggering 10,000 women.
Gina, who is mum to James, 27, Casey, 25, Cody, 22 and Summer, 4 and is nana to James’ 10-month-old daughter, previously opened up on her regret about her double E boob job and her wish to embrace a more natural look.
She said: “I really regret getting my breast implants done, I had no idea that breast implants could cause cancer until really recently. It’s terrifying.”