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Nicki Minaj, Britney Spears

Joe Scarnici/FilmMagic

After rockin' the stage with Lil Wayne for the "I'm Still Music" tour at Staples Center in Los Angeles last night, Nicki Minaj jetted off to host her after party at The Factory in West Hollywood.

That's where Britney Spears decided to drop in on her Femme Fatale tourmate's shindig, and fans began hyperventilating to the point that bouncers needed to carry them out!

A source tells us, "[It] was complete pandemonium. Six people were carried out after hyperventilating. They literally fainted when Britney walked onto the stage where Nicki was hanging."

For those still conscious, their goal was to try and reach Britney.

"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."

Nicki showed up around 12:30 a.m. and hung out with her crew, taking a break from performing. Meanwhile, Britney showed up closer to 1 a.m. with boyfriend Jason Trawick, but stayed for 30 minutes.

Khloé Kardashian Odom also attended the event, but went solo.