Sitting on a diamante "M" throne in a fringed black leotard and over-the-knee leather boots, Madonna kicked off her Sticky and Sweet tour Saturday night at Cardiff's Millennium Stadium in Wales, opening with "Candy Shop."

The 40,000-strong audience was in for a night of treats, including onscreen appearances by Kanye West, Britney Spears and Justin Timberlake, who dueted on "4 Minutes."

The image of rapper West encircled the stage for "Beat Goes On" as fans screamed and Madonna cruised through on a white vintage convertible car.

Spears made her virtual guest spot during "Human Nature," writhing while trapped in an elevator as Madonna played the guitar. The popster departed with her trademark line "It's Britney B�"!"

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