Rob Kardashian has already been subject to ridicule for his weight gain, and now he's being attacked for posting a seductive photo of his youngest sister, Kylie, on Twitter. Commenters went so far as to call the 26-year-old reality TV star a pervert.

In the photo, Kylie has her mouth open and a somewhat surprised expression on her face. She seems to be wearing a black bra. The caption reads “MEN.”

People immediately wrote Rob, calling him a pervert and saying he was trying to “pimp out” his sister. He has since removed the picture, and claimed he was hacked. “Been hacked. Amazing [sic],” he wrote.

Whether he was actually hacked remains unclear, but this is the same brother who joked with his older sister Khloe that he put some sex toys in the shower for her, and got her lingerie for Valentine’s Day.

Meanwhile, Rob’s mother Kris Jenner is reportedly trying to get him to join NBC’s “The Biggest Loser,” after he has gained at least 40 pounds in the past year. "Rob is living in L.A. right now and he's doing well, finding out what makes him tick and struggling with some stuff," Jenner told E! earlier this month, without going into specifics. "My job is to be there for him and to love him as hard as I can. Everybody goes through stuff."

Apparently, a mother's job also entails getting him to lose the weight he recently gained. “With 'Biggest Loser' being on NBC, they share a lot of the same people who make decisions with E!, so Kris has been in meetings to see if it would work to have Rob on Season 16 this fall,” a source tells Hollywood Life.

“Everyone is on board for this to happen except Rob; he still needs convincing. But most people involved in the talks think Kris will get her way and have him join the show.”