But his love life appears to be back in the spotlight after model Blac Chyna took to Instagram on Monday with a close up photo of herself wrapped in a heavily-tattooed arm.
Eagle-eyed reality TV fans noted the similarity of the mystery man tattoos and the body ink on Kardashian's left arm.
Shortly after Blac Chyna's photo was posted, Rob's other sister, Khloe Kardashian, took to Twitter with a classic line from The Godfather, and wrote, "You can do anything.
But never go against the family," leading her followers to believe she was taking a dig at her brother. She wrote, "You guys do know I have about 100 family members correct?
Though they have been together over a year, Tash and Brett have reached a point where they believe that neither understands the other.
Tash is a serious, highly intelligent science journalist while hunky Brett hosts a music video show on an MTV-like network.
Reality TV star Rob Kardashian is at the centre of complicated new family drama - he's reportedly dating Blac Chyna, the ex-girlfriend of his half-sister Kylie Jenner's boyfriend, Tyga.
The 28 year old has been keeping a low profile in recent years due to growing health concerns, and he even pulled out as a regular on his family's hit series Keeping Up with the Kardashians.
During the party on the ferry, when Guy Pearce is busted by Claudia Karvan telling the model that he has had a job offer from New York, the boat is clearly not moving.
She added the caption, "the beginning", prompting followers to speculate this was the start of a new romance, and sparking a little drama, as Blac Chyna previously dated Tyga - and the two share a three-year-old son together.
She was also close friends with Rob's older sister Kim Kardashian, but their friendship fizzled out after the rapper, 26, began dating Kylie, 18.
However, in both the scenes before and after it was.
A pair of disparate battling lovers get a chance to live in each other's shoes in this lively Australian sex comedy.
Both gain a lot more understanding when something magical happens and they find that they have switched bodies.