Sigrid, Charlie Puth, Lord Huron and Tash Sultana are also among the artists on the bill this year.
Norwegian pop sensation Sigrid shares the video for her hit single ‘Don’t Feel Like Crying’ from her debut album Sucker Punch.
Billed as a modern fairy-tale, Elle Fanning plays a timid teenager who dreams of pop stardom and escaping her small town in Teen Spirit.
The tour will launch in November 2019 and see the fast-rising Norwegian pop star performing at London’s Eventim Apollo and 3Arena in Dublin.
Last year's event saw headlining sets from Queen + Adam Lambert, The Killers and Arctic Monkeys.
Since arriving on the scene in 2017 with her debut single ‘Don’t Kill My Vibe’, the now 22-year-old quickly rose up the pop ranks.