Video: Rihanna Talks Tour, Offers Sneak Peek

Rihanna chats with “ET” before her performance on “American Idol” about how she came up with the name “Last Girl on Earth” for her tour and how it feels to have the No. 1 single in the country with “Rude Boy.” Watch her rehearse for the outing with her Mad House band and choreographer Tina Landon below.