The singers will perform at Camden’s iconic Roundhouse venue during the festival’s series of free one-off shows, joining previously announced acts including Sam Smith and Kylie Minogue.
Other acts to be announced today (August 26) for the 30-day series of gigs include Deadmau5, Placebo, Mary J Blige, Ben Howard, Hozier and Tony Bennett.
Acts previously confirmed to perform over the course of the festival’s 30-day run include Pharrell Williams, Blondie, Calvin Harris and more.
Jessie J recently unveiled the title and artwork for her upcoming third studio album Sweet Talker, which is set for release on October 13.
Meanwhile, Ed Sheeran's second LP X has just been knocked off the top spot on the UK's Official Albums Chart after eight weeks by Britain's Got Talent winners Collabro - a stint which saw him tie James Blunt's Back to Bedlam for longest-running UK Number album by a British male solo artist.
Tickets to the eighth annual iTunes festival are free to the public and available through competitions and a ballot on iTunes. Performances will be available to stream via iPhone, iPad, iPod and iTunes.
Take a look at the dates the already-confirmed acts will be performing on below:
September 2 – Beck and Jenny Lewis September 3 – David Guetta September 4 – 5 Seconds of Summer and Charlie Simpson September 5 – Kasabian September 7 – Calvin Harris and Kiesza September 8 – Robert Plant and Luke Sital-Singh September 9 – Sam Smith and SOHN September 10 – Pharrell Williams and Jungle September 11 – Maroon 5 and Matthew Koma September 12 – Elbow September 13 – Paolo Nutini September 14 – David Gray September 15 – The Script and Foxes September 16 – Blondie and Chrissie Hynde September 17 – Gregory Porter and Eric Whitacre September 18 – Jessie Ware September 20 – Rudimental and Jess Glynne September 21 – Ryan Adams and First Aid Kit September 26 – Lenny Kravitz September 27 – Kylie Minogue
Watch the video for Jessie J's, Ariana Grande and Nicki Minaj's Bang Bang below:
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