Azealia Banks and Flo Rida are among those confirmed for this year's Hackney Weekend event in London.
Other additions to the festival line-up include Chase & Status, David Guetta, Dappy, Will.i.am, Labrinth, Jack White, Emeli Sande and Lana Del Rey.
Artists previously announced include Leona Lewis, Plan B, Florence & The Machine, and Tinie Tempah.
The event, organised by BBC Radio 1, will take place on the weekend of June 23-24 at Hackney Marshes in London.
The BBC said 100,000 people would be able to attend the event, which will feature six stages, including the BBC Radio 1 Main Stage and an In New Music We Trust Arena.
It will be broadcast live on Radio 1, Radio 1Xtra and BBC Three, as well as online.
Like Radio 1's other Big Weekend festivals, the majority of tickets will go to people living in Hackney and the surrounding boroughs.
Radio 1 Big Weekend: