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Brit and Madge took to the stage at the opening of Madonna's Sticky & Sweet concert in LA.

The two belted outHuman Nature, Madge's misogynist anthem that goes a little something like this:

    And I'm not sorry [I'm not sorry]

    It's human nature [It's human nature]

    And I'm not sorry [I'm not sorry]

    I'm not your bitch don't hang your shit on me [It's human nature]


Brit was wearing black pants and a tuxedo-style white top with black heels. An X17 reporter at the concert described Britney as "ecstatic" and "so happy."

Queen B stood side-by-side with the Material girl, just kind of grooving to the music, but not full-on dancing. At the end of the number, Brit was lowered underneath the stage before a crowd of screaming fans. Our reporter said: "Britney looked awesome and the crowd was insanely excited to see her. I have a feeling she'll do another number with Madonna."

A stadium worker at the show, told our reporter he saw Brit and Madonna rehearse a number in which Britney sings and Madonna backs her up with guitar! -- We hope it's coming soon!

So now the stadium full of fans is just waiting to see if they'll get another taste of heaven -- with a cherry on top if Justin performs too!!!!!

Here's a little snippet of the performance!:




Oooh, and even BETTER taste of it!: