Justin Timberlake, Jessie J For iTunes Festival 2013
Queens Of The Stone Age & Jake Bugg also confirmed! Line-up here...
Justin Timberlakeand Jessie J are among the first names confirmed to headline this year's Jake Bugg are also due to take to the stage at The Roundhouse in Camden during the month-long event in September.
Speaking of her involvement, Jessie - who recently premiered her new single Wild - told Capital Radio: "I'm excited to see you all at this year's iTunes Festival. I'll be back with new music, a new look and a party you're all invited to!"
Apple's Eddy Cue also said in a statement: "This year's iTunes Festival is the best ever with an incredible lineup of global superstars and stellar emerging artists.
"Music fans around the world are going to love watching this incredible month of music, whether in London at the Roundhouse or on their iOS device.
"We're honoured so many renowned artists are part of this year's lineup."
Over 60 acts are set to perform during the festival, with free tickets available to competition winners via ballot as in previous years.
Further acts are set to be announced throughout the summer.
iTunes Festival line-up so far:
Queens of the Stone Age (September 6)
Jake Bugg (10)
Jack Johnson (16)
30 Seconds to Mars (18)
Primal Scream (20)
Jessie J (23)
Justin Timberlake (29)