Christina Aguilera and Lady Gaga have surprised their fans by releasing a new version of their duet track 'Do What U Want' on iTunes.
The original track, which appeared on the 'Applause' hitmaker's new album, Artpop, featured rapper R. Kelly, Us Magazine reported.
The 27-year-old singer had earlier reached out to Aguilera to perform with her for 'The Voice' season 5 finale.