The two-day dual-venue music event will take place on August 20 and 21 in Chelmsford and Staffordshire.
Aloe Blacc have been booked to perform following the current chart success of their single 'I Need A Dollar', which is presently placed at number four on the UK singles top 40.
D12 will join their former member Eminem on the lineup, with fans speculating that the two acts will team up for a collaboration of their 2001 chart hit 'Purple Hills'.
Kassidy, The Knux and teen pop-rock boyband Twenty Twenty have also been added.
Eminem and the Arctic Monkeys will headline the weekend with additional performances from Rihanna, Jessie J, Tinie Tempah and Wretch 32.
Watch the music video for D12's hit 'Purple Hills' below: