Blac Chyna is Mad at Kylie Jenner for Playing “Stepmom” to Son King Cairo (REPORT)

Blac Chyna has had enough.

Just days after Kylie Jenner threw an extravagant birthday party for Tyga’s son, King Cairo, the pregnant star, 28, is pushing back against the 19-year-old’s attempt to play “stepmom” to the four-year-old.

MORE: Blac Chyna Blames Kylie Jenner for Stealing Her Theme for King Cairo's Birthday Party (REPORT)

“[Chyna] is going to let this slide just this one time but she doesn’t like Kylie trying to complete with her and outdo her when it comes to her children,” the source tells Hollywood Life. “She saw that crazy party she threw and it was nice and she appreciated it but Kylie needs to understand boundaries and stop trying to outdo Chyna.”

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The source continues, “Chyna loves when Kylie does little things for King but doesn’t want her to do the most and spoil King more than his own mother. When her daughter pops, she’s putting all the Kardashians — even Kris [Jenner] — on notice, to make sure that they all know their roles and not try to outshine Chyna and take away her motherhood.”

Hmm… We can’t help but wonder if Chy’s jealousy has anything to do with her throwing an eerily similar party just one day before?