Madonna Sticky & Sweet Tour Pictures -- FIRST LOOK!

Madonna kicks off her “Sticky & Sweet” world tour at the Millennium Stadium in the Welsh city of Cardiff on Saturday. Her husband, film director Guy Ritchie, and children Lourdes, Rocco and David were in the audience of 40,000 strong.

The Queen of Pop, who turned 50 a week ago, included eight costume changes, 16 dancers and almost $2 million worth of Swarovski crystals during her two-hour concert.

Pharrell Williams and Kanye West, who’s featured on her latest album “Hard Candy”, appeared in video clips, as did pop princess Britney Spears. Brit recorded her segment for this last month, stuck in an elevator. In the concert vid, Brit whispers the lines “express yourself, don’t repress yourself” and it ends with her saying, “It’s Britney, b—-.”

85+ pictures inside of Madonna‘s Sticky & Sweet Tour…