The 29-year-old 'Keeping Up With the Kardashians' star has deleted all signs of the 28-year-old model - with who he is expecting his first child with - from his Instagram account, which has sparked rumours the pair have split up, according to E! News.
This news follows rumours the couple had a blazing row during filming for the hit reality show, after the Arthur George sock designer discovered suspicious messages on his wife-to-be's phone, which led to the pair deleting eachother off of social media - although Blac has since attempted to re-add her lover.
And the television personality raised alarm when he uploaded a clip of his scratched arm, which he implied was due to the mother of one - who already has three-year-old son King Cairo with her ex-partner Tyga.
In the clip Rob pans to Blac's manicured talons, after he said: ''Look what she did to me. Crazy a**.
Meanwhile, the blonde beauty has also been quiet on social media and has failed to post a single photo to her site for over two weeks since July 7, although she has kept images of her partner on her Instagram account.
However, Rob recently uploaded a picture of a pregnant Blac alongside a heartfelt message, which has since been taken down.
He wrote: ''My babies so pretty (sic).''
And the pair have previously discussed potential baby names with Rob's 35-year-old sister Kim Kardashian West.
Speaking previously, the 'Selfish' author said: ''They have talked to me about names but I would never tell because that's really personal to them. If they want to share that, they could.
''But we're just there to support them. We're so excited that we're getting a new cousin.
''I'm excited to see my brother in this role as a dad. I think he'll be an amazing dad.''
And the duo are set to launch their own reality television show 'Rob & Chyna' later this year.
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