Rob Kardashian and Blac Chyna reportedly haven't spoken for "months"

According to TMZ, Rob's sisters deliberately planned separate baby showers for him and Chyna ahead of the birth of their child in November as they felt it would be best because of their current relationship status.

While Chyna - who also has three-year-old son King Cairo with ex-boyfriend Tyga - had agreed with the plan, the family hadn't informed Rob of their decision, so he skipped the celebration and later went on a rant on Twitter which saw him give out the phone number of his younger half-sister Kylie Jenner, 19.

It was previously explained Rob had "overreacted" about the apparent baby shower snub for Chyna 28, as he was convinced his family had deliberately frozen her out.

A source said: "Rob was told that the shower was still going on for him but Chyna couldn't make it, but he misunderstood the entire thing and overreacted.

"The girls knew Chyna couldn't make it, and Chyna was cool with it, but Rob thought something was being done behind closed doors to make sure she couldn't be there."

News of problems in the pair's relationship may not be a big shock as it was previously claimed their reality show was driven by their frequent rows.

Production sources claimed they fight over a variety of issues, from Rob's weight, to posts on social media, to money and fame, and very few things are not filmed.

And the tension between them has only been exacerbated by Chyna's pregnancy.

The show was said to be "in crisis" recently as Rob had been skipping filming and worried the programme would "compromise" his relationship with Chyna.

However, a source claimed Rob was simply going through "one of his mood swings" and his behaviour - including deleting all his Instagram posts - was "nothing new".

The insider said: "He is just going through one of his mood swings, which is common for him. But he is still filming.

"He goes through his dark periods. He gets depressed and doesn't want to really do anything, doesn't leave the house. It got better for a bit when he first started dating Chyna, but he's in a rut now. He'll snap out of it."