Rob Kardashian has deleted all of the photographs on his Instagram account.

Rob Kardashian

Rob Kardashian

The 29-year-old reality TV star, who is currently expecting his first child with Blac Chyna, has unfollowed all his friends and family, including his fiancée, from the photo-sharing website.

Rob has not yet offered an explanation for the move, although it comes shortly after he followed sister Kylie Jenner's boyfriend, Tyga, on Instagram.

The 26-year-old rapper dated Chyna from 2011 until 2014 and they have a three-year-old son called King Cairo.

Chyna, meanwhile, has not done anything new with her own Instagram account, although Rob's move seems certain to spark more speculation about the status of their relationship.

In July, Rob - who has 7.1 million followers on the social media site - removed all photos of his bride-to-be from his Instagram account.

At the time, a source close to the couple said Rob's behaviour was the result of a tiff between the pair, which was subsequently resolved.

The source said: "They fought and then started talking again yesterday.

"It was just a fight. It was from the pressure of filming the show and everything moving too fast. Rob is just not used to filming again, and it's been hard on him."

Rob took to Instagram last month to congratulate sister Kendall Jenner on her September cover of Vogue magazine.

Alongside a shot of the magazine cover, he wrote: "I'm so proud of you baby Sis!!!!!!!!! September issue VOGUE!! LOVE YOU KENNY. (sic)"