Los Angeles - A relatively well-behaved Britney Spears wowed a crowd packed with superstars when she made a not-so-surprise appearance at Madonna's concert in Los Angeles Thursday night.
Wearing what the Los Angeles Times described as a demure tuxedo- style shirt, pants and black heels, Spears introduced herself with a take from her last album: "It's Britney Bitch."
She then sang along with Madonna on the last verse of the track Human Nature, to the delight of the crowd, which included Jennifer Lopez, Ryan Seacrest, Heidi Klum, Drew Barrymore, Fergie and Donald Sutherland.