Grammy Superstar List Grows

It's shaping up to be one of the biggest gatherings of music royalty in history.

RadarOnline.com has already told you about the artists who have been scheduled to perform at the Grammy Awards on February 8, names like Jennifer Hudson, the Jonas Brothers, Lil Wayne, Paul McCartney, Katy Perry, Radiohead, Carrie Underwood, and Kanye West.

Now you can add U2, Kid Rock, Rihanna, Robert Plant, and Alison Krauss to that list.