After clearing his Instagram of all pictures, the 28-year-old posted a snap of him topless and tucking into a sandwich.
Rob wrote: "#tbt me just chill-zoning in Malibu eating a pulled pork sandwich [sic]."
Rob's slightly bizarre post comes after his sister Khloe, 31, admitted that she is making him live with her as he works through his problems.
Khloe told Complex magazine: "He's going through a hard time now. Listen, he's a man and 28, and I'm sure it does't sound good to say. 'Oh I live with my sister'.
"But it's not because he has to. I'm like, 'Put this into perspective: your friends live at home with their parents because they can't do anything else. Your sister's literally holding you captive and actively making you. So if that makes you feel better, say that all you want.'
"I don't want to put words in his mouth, but I'm sure that's why he would threaten to move out."
Khloe also admitted to pampering her baby brother. She added: "I just bought him a rug for his bedroom and he was so cute. He'll text me and tell me how much he likes it and he notices things. So, I like it. I call him my son as a joke."