who's Madonna???

Madonna Louise Ciccone Ritchie (born August 16, 1958), better known as Madonna, is an American Grammy award winning pop singer, songwriter, musician, record and film producer, dancer, actress, author and a fashion trendsetter.

She is usually noted for her innovative music videos, elaborately mounted stage performances and use of political, sexual, and religious themes and imagery in her work. She is commonly referred to as the "Queen of Pop".[1]

In 2000, Guinness World Records listed Madonna as the most successful female recording artist of all time, with estimated worldwide sales of 120 million albums.[2] Her record company credits her as having sold over 200 million albums worldwide.[3] Madonna is the highest earning female singer of all time, according to the 2007 Guinness Book of Records,[4] and, according to Billboard, Madonna's 2006 Confessions Tour was the most successful concert tour of a female artist in history.[5]

Here is her official site: www.madonna.com
More reference for you: http://en.wikipedia.org/wiki/Madonna_(entertainer)