faces online backlash after she introduces a new Skims maternity ...

debuted a brand-new line of her popular shapewear brand Skims on Saturday that's aimed at pregnant women.

But the new item sparked controversy on social media as some users criticized the message that pregnant women might need to slim down.

The 39-year-old Keeping Up With The Kardashians star shared the news on Instagram with an array of pregnant women in different styles and shades of her product. 

Mixed reception: Kim Kardashian, 39, unveiled a new line of Skims maternity shapewear on Saturday, but some social media users were upset by the clothing

Mixed reception: , 39, unveiled a new line of Skims maternity shapewear on Saturday, but some social media users were upset by the clothing

Coming soon: Kim noted the maternity line would be available on the Wednesday, September 16, and would come in nine different colors; pictured in November 2019 in Santa Monica

Coming soon: Kim noted the maternity line would be available on the Wednesday, September 16, and would come in nine different colors; pictured in November 2019 in Santa Monica

'What you’ve been waiting for: @SKIMS Maternity is coming soon! Introducing Maternity Solutionwear™ that offers the best in comfort and support for your changing body during and after pregnancy,' Kim captioned the ad.

The reality star noted the maternity line would be available on the Wednesday, September 16, and would come in nine different colors.

Her Skims Instagram account also featured some closeups of the pregnancy clothing, with models caressing their baby bumps.

In addition to a one-piece set, the look also came with separate bras and full-length leggings or shorts.

Some of the clothing advertised was functional, including the Maternity Nursing Sculpting Bra with easy-to-open clasps to make it easier to nurse.

Crucially, all of the maternity bodysuits advertised 'non-compressive cores,' so as not to apply pressure on the stomach.

Closer look: Her Skims Instagram account also featured some closeups of the pregnancy clothing, with models caressing their baby bumps

Closer look: Her Skims Instagram account also featured some closeups of the pregnancy clothing, with models caressing their baby bumps

Safety first: Crucially, all of the maternity bodysuits advertised 'non-compressive cores,' so as not to apply pressure on the stomach

Safety first: Crucially, all of the maternity bodysuits advertised 'non-compressive cores,' so as not to apply pressure on the stomach

In her Insta Stories, Kim showed off the new clothing and revealed that the new Skims still had 'butt-shaping' designs, but that a thinner fabric was used over the midriff 'so it’s not compressing on your stomach which is really important because you obviously don’t want to do that.'

'But you want to shape everything else around it,' she said.

'If only there were cute bras like this that were

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