The night before Chyna collapsed at a XXX convention in Miami ... she was kicked out of a hotel party for causing a scene and passing out in the pool, TMZ has learned. It all went down Thursday night at the Catalina Hotel in Miami. The former WWE star strutted her stuff at the XXX convention kick-off party. According to our sources, Chyna pissed off multiple party-goers with her crazy antics ... most notably when she jumped in the pool naked with a friend. We're told at point ... she actually passed out in the water. Our sources says Chyna was thrown out of the party after the pool fiasco and taken back to her room to sleep it off. As TMZ previously reported, Chyna passed out yesterday in front on the main stage at the porn convention.