The list of performers for The Grammy Nominations Concert Live has been updated and two high profile pop superstars have now joined the bill. 

'Roar' beauty Katy Perry and 'I Knew You Were Trouble' superstar Taylor Swift have been added to the list and will treat event goers to live sets at the ceremony, which is due to take place tomorrow (December 6). Perry's performance will be shown live from Canada, while Swift will perform from Australia. 

The Nominations Concert will be held at the Nokia Theatre in Los Angeles and other performers include Drake, Macklemore & Ryan Lewis and country hitmaker Keith Urban. 

The 2014 GRAMMYs, meanwhile, is set to be held at the Staples Centre in Los Angeles on January 26 next year. 

Katy Perry took to her official Twitter page earlier this evening (December 5) and told her followers that she isn't feeling well at the moment so will be trying to rest up as much as possible: "I...am...finally...sick. 😩😷 Gonna do my best but if I don't stop as much as usual pls don't take it personally kittens! Mommacat needs rest!"