By Kat Giantis
Britney Spears sure knows how to drum up excitement for her forthcoming Femme Fatale tour. The popster set off a frenzy on Friday night when she turned up at a shindig hosted by her new opening act, Nicki Minaj, at The Factory in Los Angeles.
An eyewitness says Spears caused "complete pandemonium," so much so that a half a dozen people were reportedly carried out of the surging crowd because they were "hyperventilating" over being in Brit-Brit's presence.
"People were crowd surfing to get to the stage," says the spy. "Screams were so loud for Nicki and Brit you couldn't hear the music. Bouncers couldn't hold the crowd back."
Minaj, who performed earlier in the night with Lil Wayne at the Staples Center, tweeted that the arrival of Britney and fellow guest Khloe Kardashian made it "waaayyy too sexxxy in here right now."
Spears, who hit the party with boyfriend Jason Trawick, returned the compliment.
"I had such an amazing time hanging with Nicki and all the boys at The Factory in West Hollywood," she said. "Nicki is such a star and is so sweet, and you could feel the heat and the energy from the crowd the minute we walked in."
Enthused the promotion-minded superstar, "I think this summer's tour with Nicki is going to be my best ever. I can't wait!"
Britney kicks off her tour with Nicki on June 17 in Sacramento.
RELATED ON WONDERWALL AND MSN:
Chrissy Teigen cries over cheese, plus more of her funniest Instagram moments.Watch Video »
From Nicole Richie to Miley Cyrus, check out these embarrassing celebrity bikini malfunctions!Watch Video »
Tats for Love
From Heidi Klum and Seal to Ryan Sweeting and Kaley Cuoco, see which stars got tattoos for love.Watch Video »
See how Sarah Michelle Gellar, Cindy Crawford and more stars celebrated Cinco de Mayo on today's Celebs Gone Social.Watch Video »
Check out Gisele Bundchen and Tom Brady's cutest family moments on today's Celebs Gone Social.Watch Video »
Shailene Woodley and the stars of "Divergent" chat phobias and on-set injuries at the film's world premiere.Watch Video »