Posing in flesh coloured knickers, Nadya - who shot to fame when she gave birth to her EIGHT babies three years ago - says she has lost TEN STONE since her octuplets were born.
The mum-of-14 (yes, she already had six children) says she does not believe in diets, but eats healthily, telling Closer magazine: "I'm a pescatarian and eat 15 portions of fruit or vegetables a day. I eat so much!"
But the also reveals she runs 40 miles a week, and started doing 50 sit-ups a day just two weeks after her C-section.
I just pinged back into shape like a rubber band after the kids, I don't know how I did it.
"I eat like a horse, don't count calories and have never owned a set of scales,' she said, adding 'I gained an entire human when I was pregnant with the octuplets, going from 10st to over 19st, but two months later, I was a size 8 again. Now, I never weigh myself."
The super-mum says that she has done a 'really great job' with her kids, yet never gets any credit for it. (Er, despite saying previously she hates her kids and cannot cope!)
Nadya, 36, who lives with her brood in La Habra, California, already had six kids – Elijah, now 10, Amerah, nine, Joshua, eight, Aiden, six, and twins Caleb and Calyssa, five, who were all born through IVF using a sperm donor – when she decided to have more embryos implanted in 2008, using the same donor.
Despite being shocked when she discovered she was carrying octuplets, as she insists she didn't realise so many embryos had been implanted, Nadya decided to go ahead with the pregnancy.
"I was grabbing my head and thinking: 'Oh God, please God don't let there be eight' – but there was no way I could have aborted them, that would have been murder," she explains.
In 2009, she gave birth to six boys and two girls – Noah, Jonah, Jeremiah, Isiah, Josiah, McCai, Maliah and Nariah, who turned three in January – making them the longest-surviving set of octuplets in American history.
"I didn't really mind how I looked when I was pregnant. It happened gradually, so I got used to it. It's all part of being a mum, it's natural," she says.
"I got stretch marks on my stomach and a lot of veins came out. But it didn't matter to me. Even now, I'm proud of my stretch marks, although they've faded.
"My breasts had already grown back to a DD after the other kids, but they only sagged a bit with the octuplets and I breastfed them all – I don't know how my body did it!"
Despite insisting she 'pinged' back into shape, Nadya does admit that just two weeks after she gave birth, she began doing 50 sit-ups a day – even though she had a C-section and mums are advised not to exercise for six to eight weeks afterwards – and hit the gym three times a week for two-hour stints in the middle of the night while a friend babysat.
"I'd sneak off at 11pm, but it wasn't to get skinny, just to get stronger," she insists. "I've never believed in diets – I just eat healthily. I'm a pescatarian and eat 15 portions of fruit or vegetables a day. I eat so much!
"Now, I run 40 miles a week, whenever my mum or a friend will babysit, but it's still just for stress relief. My eldest son even comes with me sometimes – he can manage a couple of miles."
Meanwhile, Nadya maintains she's coping perfectly well with her brood alone. Claiming she doesn't take state handouts and relies solely on funds from publicity interviews and photo shoots – although she's eight months in arrears on her mortgage and facing eviction from her four-bed home – she completely denies previous interviews in which she was quoted as 'hating' babies, describing her older kids as 'animals' and regretting her decision to have so many.
In the interview she says: "I love looking after them, they're the least of my stresses. I'm such a good mother. I'm so loving and my kids are so happy. There's never been a time I've regretted having so many.
I can't believe how fortunate they are, too. I'd love to be an octuplet – their camaraderie and bond is amazing. They look out for each other, they're so lucky.
And she insists there's little rivalry between them because her attention is not divided.
"My love just grows. And I've trained them so well, they can brush their own teeth, dress themselves and scrub each other's backs – they're so independent," she explains, adding that the older kids help with the housework, giving her time to do the family's five loads of washing a day. "It's not chaotic," she insists. "They're very quiet and obedient and they're well-behaved and smart.
"The kids have structure and discipline and only eat healthily – they don't know what candy is! I've done a really great job with them – I don't get any credit."
The downside is that her enormous brood has left her no time for a man, and despite the fact she gets 'too much male attention,' Nadya claims she will not start dating again until the octuplets are 18!
Nadya also says she has been celibate for 13 years - all of her 14 kids were conceived through a sperm donor - and says she hates male interest and has no interest in dating. So much so she claims to 'go out with no make-up on and wear tracksuits, a wig and even a fake pregnancy stomach to put them off.'
She goes on to reveal: "I've only ever slept with two men. The first was when I was 20 – we stayed in touch and he's been my sperm donor, but we don't talk now. The second was when I was 21. He was my boyfriend for five years. We tried for kids, but couldn't conceive."
She adds: "I wouldn't rule out a relationship in the future. But now, when men look at me, I look away and they know not to approach me. I know I'm beautiful – I don't need a man to tell me that."
This week's Closer magazine, with a free real life supplement, is on sale now.