Katy Perry, T-Pain and Elton John Added to Grammy Awards Line-Up

A bunch of acclaimed musicians have been added to the already star-studded line-up of the 52nd Annual Grammy Awards. Katy Perry, T-Pain and Elton John are the latest names thrown to the stellar ensemble. While Katy is set to present award, T-Pain and Elton will be singing. Other celebrities booked to announce winners of the awards show are Alice Cooper, Placido Domingo, Wyclef Jean, Juanes, Miranda Lambert, John Legend, Lionel Richie and Seal. Movie director Quentin Tarantino and "Glee" actress Lea Michele are also among the latest presenters.