http://www.katyperry.com/

http://en.wikipedia.org/wiki/Katy_Perry

http://www.myspace.com/katyperry

http://katyperryblog.tumblr.com/

http://www.youtube.com/watch?v=y-LhyAVzDBI

http://www.katy-perry.org/

http://twitter.com/katypeRry

http://www.mtv.com/music/artist/katy_perry/artist.jhtml

http://www.last.fm/music/Katy+Perry

http://katyfan.com/