Patrick Wolf for Get Loaded In The Park 2011
More acts added across several stages at London event
They'll play on the Main Stage at the festival, which takes place on Clapham Common, London
on Sunday 12 June.
The Last.Fm Stage, hosted by The Flowerpot, will be headlined by Johnny Flynn, with Slow Club, Sound Of Rum, The Agitator, Beans On Toast, Dark Moon and The Joker and the Thief all set to play as well.
Babeshadow, Yelle, O.Children and Alpines will play the Gigwise stage.
Razorlight will headline the event, with The Cribs, Noisettes and British Sea Power also confirmed.
Early Bird tickets are on sale now, priced at £35.