Rob, who is currently working on losing weight and getting healthy, clearly knows the importance of a cheat day. And he's encouraging his big sis to take full advantage of it as she rings in her 35th year.
"Cheese fries all day baby," he captioned the pic.
And since Kanye West threw his wifey a sweet surprise party, we're hoping he didn't miss Kardashian's favorite fried treat.
It definitely sounds like it could have been that kind of party. Well, a fancy version of that kind of party, at least.
Guests were treated to a black-and-white-themed bash at a movie theater West rented for the evening. Gifts all matched the theme, as did the flower arrangements set up outside.
Although it does seem like West opted out of a cake for the evening. Instead, guests munched on churros. Hmm, it looks like Kim definitely has a soft spot for fried goodness. Not that we blame her.
Aside from encouraging Kim to splurge all day, Rob also posted some sweet throwback photos from a vacation the siblings took together in which Kim is sneaking in smiles behind Rob.
He also shared his adorable nicknames for his sis, referring to her as "Kimbo" and "Kimburrr" throughout the posts.
According to People, Rob did not attend his sister's birthday bash.
Khloé also missed the swank as she continues to stay by her husband Lamar Odom's side as he recovers from his near-fatal overdose.
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