Let's hear Katy Perry sing "I Kissed a Girl".

NPR: Coldplay, Katy Perry and More New Releases

Her UK number one hits include Can't Get You Out Of My Head (Kylie Minogue), Toxic (Britney Spears), I Kissed A Girl (Katy Perry), About You Now (Sugababes) and Anything Is Possible (Will Young).

BBC: Hit maker Cathy's road to success