FANDEMONIUM! NICKI & BRITNEY CAUSES 6 FANS TO GO TO THE HOSPITAL!

Enrique Iglesias, who?

After the Latin singer dropped out of Britney Spears' upcoming Femme Fatale tour, the pop star partied with his replacement, Nicki Minaj, on Friday night.

The rapper was hosting an after-party at West Hollywood club The Factory when Spears dropped in at 1 am and took fans' breath away -- literally.

Six shocked fans had to be taken out of the club by security after they began hyperventillating, according to E! Online.

"[It] was complete pandemonium," said a source. "They literally fainted when Britney walked onto the stage where Nicki was hanging. People were crowd surfing to get to the stage. Screams were so loud for Nicki and Brit you couldn't hear the music. Bouncers couldn't hold the crowd back."

Spears caused such a ruckus, she only stayed for 30 minutes before heading to the exit with boyfriend Jason Trawick.

Not only will Spears and Minaj tour 26 cities in North America starting June 17, but on Tuesday, the two ladies can be heard on the remix of Spears' new single, "Till the Workd Ends." The new version even includes fellow pop star Ke$ha, who actually wrote the track for Spears.

"You ladies think they are ready for the final version of the #TTWEremix?" Spears tweeted on Monday. "17 hours till the femme fatales hit the air. Th-Th-This is the remix!"


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