'Mommy gained 20 pounds!' Blac Chyna reveals her weight after hitting back at critics of her pregnant figure

She is expecting a child with fiancé Rob Kardashian.

And Blac Chyna was rattled to learn she had gained twenty pounds when she stepped onto the scale during a Saturday in with her three-year-old son King Cairo.

The pregnant 28-year-old Snapchatted the weigh-in, exclaiming to her son as the numbers 163.2 flashed onto the screen, 'Mommy's gained 20 pounds!'   

Weighing in: Pregnant Blac Chyna was rattled to learn on Saturday that she had gained twenty pounds when she stepped onto the scale during a day in with her son King Cairo

In the videos, the model also asked her son, whose father is her ex-fiancé Tyga, about her future child's gender.  

It comes not long after Blac took aim at trolls who were criticizing her changing body.

In the now deleted post, Blac 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.

Another on the way! Chyna, pictured in Los Angeles on Friday, and her fiance Rob Kardashian announced the pregnancy earlier this month

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. 

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

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

Her little one: Blac was busy spending time on Saturday with her son King Cairo, whose father is her ex-fiance Tyga

With love: The 28-year-old spoke about her future child with her three-year-old son

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

Blac and her fiancé Rob Kardashian confirmed the pregnancy earlier this month.

During a recent episode of Keeping Up With The Kardashians,  Rob oddly joked that he had a son named 'Robert the third.' The sock entrepreneur was named after his late father, prominent attorney Robert Kardashian.

Because he is Robert II, if he named his son Robert as well, that child would be Robert III. 

So in love: Rob and Chyna, pictured in New York on Wednesday, started dating in January 2016 and became engaged in April

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Blac Chyna will soon become a member of the Kardashian family, and it looks like she's taking the whole thing in her stride.

She's engaged to Rob Kardashian, and we know that diamonds are supposed to be a girl's best friend, but it's her shoes that we've fallen head over heels in love with!

They're by Alaïa and the pom pom embellishment is an instantly recognisable design that has always been worn by Rihanna and Blac Chyna's future sister-in-law Kim Kardashian.

If you're a heelaholic then these Alaïa beauties are the ultimate addition to your collection. Click the link (right) to buy the ankle strap version at Net-a-Porter, then team yours with a classic LBD to really knock their socks off on your next night out.

Or put your best foot forward in a pair of pom pom heels from the edit below. Miss Pap's version could definitely pass for designer, or splash out on Aquazzura's take on the trend.

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Rob and Blac went public with their relationship in January 2016 and became engaged in April.

And with Rob and Chyna planning to get hitched, the Kardashian clan have begun to warm to Blac once more - after feuding with her while Kylie Jenner was dating the model's ex, Tyga.

On a recent episode of Keeping Up With The Kardashians, Kim Kardashian explained: 'She gave him confidence, more power to her.

'After Rob and Blac Chyna started dating, Rob is now, like, all over social media and, like, out and about.' 

Hitting her stride: The star was spotted out in Los Angeles in sporty gear