It looks like there’s some sibling rivalry in the Kardashian-West house!

Sporting her new bob haircut, Kim Kardashian stopped by The Ellen DeGeneres Show to talk about everything from the Paris robbery to mom Kris Jenner’s reaction to Caitlyn Jenner’s tell-all book. But, unexpectedly, Kim revealed that a feud was going down in her household… between North West and little bro Saint!

The mother-of-two, who welcomed baby Saint in December 2015, gave Ellen the low down about the jealousy and sibling rivalry that’s been brewing between her two children, citing her three-year-old daughter as the instigator.

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“North just beats [Saint] up all day long,” Kim said. “She’s just awful. She’s just so jealous, and I thought it was a phase, it’s not going away!”

The 36-year-old said her toddler daughter has a laundry list of rules for her little brother to follow.

“[North] says that boys aren’t allowed in her room,” the selfie queen told Ellen. “When she’s gone at school, I’m like, ‘It’s time! Let’s go in her room! Do whatever you want, go crazy!’ She’s just so jealous!”

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The rules don’t just go for little Saint. Nori lets her mom know what she can and can’t do too.

“I can’t hold him, I have to stop breastfeeding him,” she said. “When I was breastfeeding him, she was so jealous I had to get a little milk box and put it in the other bra with a straw. So he would drink and she would drink! She’s so jealous.”

The brunette beauty swears, though, that her daughter didn’t inherit her attitude from her and points to hubby Kanye West as the person who supplied North with her sass.

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“She is Kanye’s twin,” Kim laughed. “Same personality, says the same wild things!”

Though North’s attitude may never change, Mrs. West did reveal that since the Paris robbery, her view on motherhood has changed drastically.

“I know this sounds crazy, but I know that was meant to happen to me. I don't want to start crying, but I feel like that was so meant to happen to me," Kim said as she wiped tears away. "I'm such a different person…I was being flashy and I was definitely materialistic before…I'm so happy that my kids get this me and that this is who I'm raising my kids [as]. 'Cause I just don't care about that stuff anymore. I really don't."

Watch Kim’s full interview below: