Chicago will join the "Blurred Lines" singer, while Metallica will also deliver a special performance.
Katy Perry, Lorde, Robin Thicke and Metallica are the latest additions to the performers list at the 56th annual Grammy Awards, set to take place live from Los Angeles' Staples Center on Jan. 26.
Up for four awards, including record of the year and song of the year for her No. 1 smash "Royals," Lorde will make her Grammy Awards debut after performing at the "Grammys Nomination Concert Live!!" last month. Perry will compete against Lorde in the song of the year category, where her eighth Hot 100 No. 1 single, "Roar," is nominated.