The “Glamorous” singer has become the newest spokeswoman for the cosmetics company’s campaign  that began in 1994 and has raised more than $100 million for HIV/AIDS, joining Dita Von Teese and Eve.

49-year-old superstar Madonna is named the richest woman in music by Forbes, earning $72 million between June 2006 and June 2007.

The Black Eyed Peas star hit the stage with the zip on her white trousers wide open while supporting The Police at a concert at Westpac Stadium in Wellington, New Zealand, on Thursday (Jan. 17).