Showing it off! Rob Kardashian's fiancée Blac Chyna highlights pregnant belly as well as generous backside after joking she wants to gain 100lbs 

She said on Sunday during a Snapchat session that she wants to 'gain like 100lbs in this pregnancy.'

But later that night Blac Chyna looked like she's still fairly slender.

The 28-year-old fiancée of Rob Kardashian showed off her little pregnant belly in a snug zip-up jacket as she walked to her SUV outside Busby's in Hollywood past midnight. The model also flashed her sizable backside.

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No maternity clothes here: Blac Chyna left little to the imagination as she steps out in Hollywood past midnight on Sunday in tight workout gear

Bumps: The 28-year-old model gave a look at her pregnant belly as well as her sizable backside

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Showing off her growing baby bump, she sported a black bodycon zip up top and matching leggings, setting off her look with her new scarlet locks, but it was her Chanel sliders that really caught our eye!

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The ex of rapper Tyga (who she has son Cairo with) also had on a very tight pair of semi sheer black workout leggings that left little to the imagination.

The future daughter in law of Kris Jenner, 60, also wore jazzy slides that showed off her foot tattoo and she wore a red wig.

Long, pointy green nails made her look ready for Halloween.

See more Blac Chyna updates as she highlights pregnant belly in Hollywood

Red Sonja: Chyna usually has blonde or black hair, but on this night her wig was red

Those aren't Louboutins: The future daughter in law of Kris Jenner, 60, also wore jazzy slides that showed off her foot tattoo

Time for bed? The mother of one was getting into her SUV very late at night after leaving Busby's

The former best friend of Kim Kardashian held onto a smart phone in one hand and also had a bag on her arm, which was from Kendras Boutique.

She was also seen walking behind a handsome man.

He had on a grey sweatshirt and a red cap.

That sure is NOT Rob: She was also seen walking behind a handsome man. He had on a grey sweatshirt and a red cap

There was no sign of Rob, who she has been filming a new E! reality show with simply titled Rob & Chyna. The show will launch in the fall.

On Sunday afternoon the pinup said on Snapchat: 'I'm gonna gain like 100lbs in this pregnancy. I'm gonna tear it up, then I'm gonna snap back.'

It was clear the Calabasas resident was joking. 

Snacking: Chyna took to her Snapchat on Sunday to document a meal she was preparing as she even joked about how much weight she was going to gain

Bumping along: The 28-year-old model later shared a short video featuring her growing baby belly

She finished off the declarative statement but stuffing her face with chips and salsa.

Chyna definitely seemed to be proud of how she has come along in her pregnancy despite the weight gain as she posted a snap showing off her growing baby belly. 

The snap begins with the person holding the camera following her from behind to show of her curvaceous figure while wearing a black sports bra and matching athletic leggings. 

Big reveal: She turned around in the short video to reveal her growing baby belly

She then turns completely around to show off her round baby belly. Chyna posted a still from the short clip with the caption: 'when they can't tell your pregnant from the back.'

Prior to displaying her body, Chyna showed off her cooking skills as she prepared a tasty meal of grilled cornish hen stuffed with butter, chips and salsa, kale sauteed in butter and honey balsamic sauce.

Though it seemed to be quite the hefty meal, the Lashed owner made sure to finish her food as she shared another snap of completely empty plate and saucer.

Secret ingredient: She shared several snaps of herself preparing a meal as she seemed to use plenty of butter

Greens up: She sauteed the kale in butter 

Yum: She also prepared some cornish hens, stuffing them butter and onions 

She said: 'And this is what I feel about this. Goodbye, good riddance, outta there, hasta la vista.'

After the meal, Chyna decided to weight herself as she said: 'Before I got pregnant, I was bout 139. Do you guys remember that? Let's see where we at.'

Then she stepped on the scale which read 165.3lbs and reacted by yelling in a high-pitch.

This comes just weeks after she hit back at trolls for making negative comments about her changing body. 

Finished product: At the end of the series of posts, she shared this image of the cornish hen with butter sauteed kale and balsamic sauce

In the now deleted post, Chyna wrote: 'To all you people out here with negative comments and insecure words (obviously because you have nothing else to do but criticize the next) I AM HAVING A BABY!'

She continued that she wants her pregnancy to be as comfortable as possible and that she wants to keep any negativity away from her future child,

She wrote: 'Exactly what do you expect to see?! If I walked out in makeup and heels everyday to be beautiful to you means I WOULD BE MISERABLE AND UNHAPPY which are two vibes I refuse to transfer to my little one.

Gains: She later shared an image of herself stepping on a scale as she has gained over 26 pounds

'If I comment on y'all pics and go in on them tired ass weaves or unblended ass contours I'll be wrong right?

'It'll be tragic! So stop playing & Put Some Respeck on my name.'

The strongly worded caption was accompanied by photos from her relaxing poolside outing in Miami last month. 

Chyna and Rob started dating in January 2016 and became engaged in April. 

Hitting back: Blac took to her Instagram to call out those criticising her pregnancy weight gain last month