"What a Girl Wants" is a song by American pop/R&B singer, Christina Aguilera, taken from her 1999 self-titled debut album. It was written by Shelly Peiken and Guy Roche, and is one of Aguilera's most successful songs to-date, having reached number-one on the Billboard Hot 100, as well as topping the charts of several other countries around the world. "What a Girl Wants" is possibly one of Aguilera's most indentifable songs, especially among young girls, or girls who were young at the time of the single's release in the late 1990's.