Set to be the biggest free-ticketed show hosted by Radio 1, Hackney Weekend 2012 will take place on London's Hackney Marshes over the weekend June 23-24.
Sean Paul, Tinchy Stryder, Devlin, Chip and Mindless Behaviour have also been confirmed to play the two-day event.
Florence + the Machine, Leona Lewis, will.i.am, Jessie J, Ed Sheeran and Lana Del Rey are among the acts who were previously announced to play the festival.
Registration for the batch of 100,000 tickets is open now and closes on March 19. People who have registered will then have two opportunities to apply for tickets on March 25 and March 26.
Although tickets are free, a small charge of £2.50 per ticket will be required to cover handling and administration costs.
Watch the music video for Flo Rida's 'Wild Ones' below: