Pittsburg-based Wiz Khalifa is the latest name to be confirmed for Oya Festivalen, which takes place from 10-14 August at Middelalderparken in Oslo.
It will be the 23-year-old rapper's first appearance in Norway.
He joins Phaedra, Warpaint and Comeback Kids on the line-up for the festival, which last year hosted Iggy Pop, The Gaslight Anthem and Paul Weller.
A new act will be revealed every day this week on the festival's website – Explosions In The Sky and folk-rockers Fleet Foxes were announced on Monday (11 Jan) and Tuesday (12 Jan).
Oya Festival 2011 tickets are available now, with four-day passes priced at 1995 NOK.Day tickets will go on sale on Monday 17 January.