A host of big names including Justin Bieber and Britney Spears have been announced for a massive Christmas radio show.

The two acts will perform at the KIIS FM 102.7 Jingle Ball on December 2 at Los Angeles' Staples Center.

Also on the bill are Bruno Mars and One Direction's Niall Horan.

They're joined by Meghan Trainor, Fifth Harmony, Diplo, Alessia Cara, Lukas Graham and Daya.

The show is one of a number radio shows taking place across America in December.

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Watch Justin Bieber in action below: