The lineup for the 51st Annual Grammy Awards swelled on Thursday morning with U2, Rihanna, Kid Rock, Robert Plant and Alison Krauss joining the previously announced Justin Timberlake and Paul McCartney. Gwyneth Paltrow, Duffy and Josh Groban will be presenters as well. Paltrow's husband Chris Martin will be playing with Coldplay during the festivities. The broadcast will come live from Los Angeles on Sunday, Feb. 8, at 8 p.m. on CBS. (Photo: WENN)