As Entertainmentwise reported yesterday, Britney Spears and Justin Timberlake were 'surprise' guests at Madonna's L.A. show last night.

The pop princess joined the megastar to open the show at the Dodgers Stadium in Los Angeles to sing a version of Human Nature, catching the audience off-guard with her early appearance.

Wearing black baggy pants and a white top, Brit stunned the sold-out crowd by singing and dancing alongside Madge before being lowered beneath the stage as the crowd chanted her name.

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It was a tame stage collaboration compared to the last time Madonna performed with the Piece Of Me star - the pair hit the headlines back in 2003 when they locked lips during a wedding themed routine at the MTV Video Music Awards.

And Britney's ex Justin Timberlake later wowed the crowd as he shared the stage with Madge for an energetic performance of their hit 4 Minutes.