Rob Kardashian's struggle with weight loss seems to be paired with alcohol addiction as his family bans him from attending a portion of Khloé Kardashian's birthday celebrations.

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Rob, who is said to be on the outs with his famous family, joined Khloé in Las Vegas as she continued her extravagant festivities for her 30th birthday this weekend. But he couldn't attend all of the events.

An insider revealed Friday, "Rob will be joining in on the festivities for Khloé's birthday, but the family wants him to not join in the club portion of things due to all the temptations it will bring with alcohol. Khloé wants him there for her birthday, but he will be a part of all the private stuff Khloé will do tonight and not the paycheck portion of the night."

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Khloé's rumored boyfriend, French Montana, also continued the celebration with her this weekend.

Kardashian matriarch Kris Jenner might have confirmed Rob's issue with the family as she failed to mention him in her festive Independence Day Instagram post Friday. She shared a collage of all of her children (sans Rob) and herself with the caption "Happy 4th".

Rob is allegedly addicted to laced sizzurp. While Rob seems to be having issues with his family, Khloé is his consistent supporter. She shared a throwback picture of her and Rob on Instagram Thursday and added three hearts as the caption.

Still, a second insider said Khloé is "rocked to her core" by Rob's partying habits.

"Khloé can't think right now; she's just in disbelief right now that her little brother is going through these issues. She realized he's been troubled for a long time now but was in the dark that it's reached this level. She can't deal. She feels low because she's been through this before with her and and it's all too familiar and another earthquake that's rocked her core."

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