The sibling rivalry is strong in the Kardashian-West household. And, as it turns out, North West has some savage ways of excluding her little brother, Saint West, from playtime. Kim Kardashian broke it all down while co-hosting LIVE with Ryan Seacrest on Monday. "I don’t know if it’s because she’s the older sister. I don’t know what it is. I thought it was a phase. She does not like her brother and it’s so hard for me," she said while filling in for Kelly Ripa this week.

She continued that North West isn't easing up on her little bro, either: “She would get so jealous when I would breastfeed and all that kind of stuff. And now, the phase isn’t going away.”

Kardashian, who recently joined forces with North West for a Jackie O-themed photo shoot for Interview, explained the one cunning move her little girl likes to use on her younger sibling. “She thinks she’s outsmarting me. Like, she’ll have a tea party and say, ‘No boys allowed.’ Dad can't come too then -- no boys," Kim explained. "And she'll slam the door on her brother's face and he'll just start crying."