Perry to perform at Grammy nods
Katy Perry and Justin Bieber are to perform at the Grammy Awards nomination special.
The Grammy Nominations Concert Live!! - Countdown To Music's Biggest Night will also see performances from country singer Miranda Lambert, rapper B.o.B and singer-producer Bruno Mars.
Two-time Grammy-winning rapper LL Cool J will host the one-hour special, to be aired in the US on December 1.
The 53rd Annual Grammy Awards will take place at the Staples Centre in Los Angeles on February 13.
Additional performers and presenters for the nomination special will be announced later.