Blac Chyna just one upped her baby daddy Tyga in the birthday department ... entertaining their son King Cairo and his friends for the boy's third birthday with a full-blown fair.
The party had all the trappings -- funnel cake stand, taco booth, face painting, water balloons, and not one, but 3 piñatas.
Christina Milian, Karrueche, and Bad Medina joined in for the fun.
BC thew her party a day after Tyga took King Cairo and his buddies go-karting.
And the winner ... King Cairo.