Kim Kardashian May Have Been Left Off Sister Kendall Jenner's Birthday Bash List

Could there be trouble in Kardashianland?

— -- Trouble in Kardashian paradise?

"I asked Kim, 'Oh, are you going tonight?' and she was like, 'I didn't know Kendall was doing anything!'" Khloe added. "I don't know if she was late to be invited, but I'm invited, so I feel good about that!"

Khloe, 30, also gushed about how much Jenner has accomplished in just 19 years and that "I'm so proud of her, and she's still such a good girl."