Katy Perry is working on an upcoming duet with her BFF Rihanna. But the "California Gurls" singer says that she wants their track to live up to the hype- stating she would rather do a song that channels the Eurythmics featuring Aretha Franklin, then Beyonce's and Shakira's "Beautiful Liar". Katy wants to do a song that is iconic. Katy and RiRi are not in a rush to release the track. The two started talking about the collaboration 2 years ago.