Amy Winehouse and Lily Allen are responsible for the new wave of female artists in the charts, according to pop star Katy Perry.
The 23-year-old's hit song I Kissed A Girl topped the U.S. and U.K. singles charts earlier this year (08) and she believes stars such as Winehouse and Allen paved the way for her success.
She says, "I think there's a healthy dose of oestrogen in the world today. Amy Winehouse and Lily Allen have definitely helped with that. They have introduced America to great music."