'Losing 50lbs was the greatest challenge of my life!': Kim Kardashian reveals her post-baby weight loss in white lace dress that displays her black underwear

'I've down 50lbs today!': Kim Kardashian revealed her dramatic post-baby weight loss in black underwear and a see-through lace dress on The Tonight Show with Jay Leno on Wednesday night

Hurt feelings: Kim said the 'ridiculous' criticism she received for putting on the weight was incredibly painful

'Hurt my soul': Kim said criticism of her pregnancy figure 'really hurt her soul'

Sheer daring: Kim left little to the imagination in her see-through lace dress

The 33-year-old said gaining weight while pregnant with daughter North was not easy.

'I can honestly say it was the greatest challenge of my life,' she said.

And she confirmed reports she lost the weight on the Atkins Diet, adding 'it worked for me'.

 

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Kim also revealed she chose the diet after it was previously successful when both she and her late father Rob tried it when she was a college student.

Kim said the 'ridiculous' criticism she received for putting on the weight while pregnant was incredibly painful.

Hard times: 'I can honestly say it was the greatest challenge of my life,' Kim said of her weight gain

Happy girl: Kim said Kanye West's lavish marriage proposal was 'the most magical night of my life'

Criticism: Kim's outfit at the Met Gala was roundly panned as unflattering

She wore her blonde hair sleek and wavy over her shoulder and kept her makeup fresh and natural.

Kim and new fiance Kanye West kept out of the public eye following the birth of their baby in June, but she denied they went into 'hiding'.

'I just wanted to have time with her and be with her. This was the one time in life that I could just take off and spend time as a family with me, and him and the baby. So we both took a maternity leave,' she said.

Proud mama: Kim gushed about her four-month-old daughter 'Nori', calling her 'the sweetest little girl'

Lucky lady: Kim showed off her ring as she admitted Kanye's proposal was the 'most magical' night of her life

The best accessory a girl could want: The reality star showed off her 15-carat ring, believed to have cost £1.6million, as she sat down for her chat

But Kim said her life is going well at the moment after Kanye surprised her with a lavish marriage proposal on her 33rd birthday last week.

'I'm very happy right now,' she said. '[The proposal] was the most magical night of my life.'

And she described the night in detail.

'I thought we were just going to dinner for my birthday,' explained Kim. 'He just told me to close my eyes... he covered my eyes.

Upping the glamour: She wore her blonde hair sleek and wavy over her shoulder and kept her makeup fresh and natural

'I thought I was going to fall and he was totally helping me [out of the car]. It's so it his personality to do something wild for my birthday.'

Hot property: Kim looked incredible in the frock, which she paired with strappy black heels

Even though she found herself standing in a baseball field, Kim still didn't guess what was about to happen.

'My favourite Lana song started playing, Lana Del Rey Young And Beautiful. And I was like, Oh my God he got Lana to play for me on my birthday.

'I thought that was my birthday surprise. And she doesn't get out and he goes down on his knee. And I was shaking the entire time.

After Kanye proposed, Kim's family rushed the field.

'The whole family thought they were there for my surprise party, and I thought they were in Arizona. He told them a surprise party, I need you guys there.

'The look on their faces - I turn around and see them balling.'

But the couple haven't yet had the chance to discuss their wedding, although Europe might be on the cards as a possibly venue.

'I want [Kanye] to have whatever he wants,' she said, adding that 'someplace Parisian' might be an option.

The pair are 'hoping for next summer,' she said, but they 'haven't had time to sit down and talk about it'.

Kim also gushed about her daughter, nicknamed Nori, calling her 'the sweetest little girl.'

'She never cries,' Kim said of the four-month-old. 'She's a perfect little angel. I hope she grows up to be smart and opinionated like her dad.'

Kim also confirmed that she plans to take her husband-to-be's last name.

'It'll definitely be West,' she said. 'My daughter's name is West, and we're a family.' But it wasn't all happy.

Making her exit: Kim kept her head down as she left the studio after the interview

Porcelain doll: Kim sat pretty for the camera before the car pulled off

Kim also opened up about her family's recent troubles, confirming that her mother Kris Jenner has split from her husband Bruce.

'They are [separated]. And it is for the better, and the best way.

'I think they are better living in two separate homes. They get along better. I'd rather them live together and be happy.

'They are better friends now.'

Perhaps surprisingly, Kim said Bruce would still walk her down the aisle, saying simply 'of course', in answer to Leno's question.

'Our family I would say is the biggest most happiest dysfunctional family,' she added.

And of sister Khloe she said simply: 'She's doing good, she's doing really good. And I think all you want for your family is to be happy.'

All grown up: Abigail Breslin looked the height of glamour in a sophisticated black frock and crimson lips on Jay Leno after Kim's appearance

Big year: Abigail is currently promoting the upcoming film Ender's Game