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If you thought Kim Kardashian was happy for her sister's big news, think again! At least that's what Kourtney revealed on producer Ryan Seacrest's radio show today...

The preggers reality star states: "Kim gets mad if I get the car that she wants. She like freaks out! She definitely thought it was going to be her first, trust me."

Ouch! A little sibling rivalry here or just an attention-grabbing sound bite? Still, Kourt maintains that "I don't think she's [Kim] envious."

What do YOU think???