“If only you could see yourself through my eyes!” Khloé, 31, captioned a throwback photo of herself and Rob on Monday night. “I’ll forever be obsessed with you! My one and only! #MyAce.”
The Instagram photo shows Rob, 28, kissing his big sis on the cheek.
The younger Kardashian has steered cleared of the public eye for more than a year, with the exception of a few Instagram posts.
RELATED VIDEO: Khloé Kardashian Says of Reclusive Brother Rob, ‘I Can’t Win Life for Him’
However, Instagram posts by the 28-year-old have indicated that he’s getting back into shape.
Kardashian recently opened up to PEOPLE about her brother’s struggles and described him as “such a great guy.”
“I’ve been working on my patience,” Kardashian said. “I’ve been really trying. But I have my moments and I do snap I can’t win life for Rob. I have to wait until [he’s] ready to do it for himself.”