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The singers will perform live at this year's awards do.
Adele, who has been nominated for seven Video Music Awards, will be singing at the MTV bash.
The 'Someone Like You' singer has been nominated for seven awards, only beaten in the nods by Katy Perry who is up for nine gongs.
Chris Brown and rapper Lil Wayne have also been added to the bill and will perform at the LA show on 28th August.