T.I. is also added to the bill
Singer says she's 'severely happy'
Band promise 'different' sounding album
Hayley Williams warns fans about ex-stepdad
Haley Williams' ex-step-father touting her stuff
The group announce final shows for 'RIOT!'
The Seattle festival keeps growing
Hayley Williams says new record is shaping up to be 'heavier'
Plus band reschedule UK dates