Some of the key acts for the annual iTunes Festival have been announced. Justin Timberlake and Jessie J have been revealed as confirmed performers for the month-long event, where concerts take place every night in September at The Roundhouse in North London. The gigs can be watched live, as well.

Jessie J will get 'Wild' when she performs. The singer said, "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."

A new look and new music? Bring it, Jessie!

Other confirmed acts include Jack Johnson, Primal Sceam, Thirty Seconds to Mars and Phoenix.

The first iTunes Festival took place in 2007. Since then, over 370 acts have performed, ranging from Adele to Alicia Keys.

Fans can grab tickets here.