Animated family comedy Rio has flown to the top of the U.K. box office chart with an opening haul of $2.4 million (£1.5 million).
The 3D movie features the voices of Anne Hathaway and Jesse Eisenberg and follows the adventures of a 'birdnapped' parrot in Brazil.
Jake Gyllenhaal's suspense thriller Source Code trails in second place with $1.34 million (£840,000), while Bradley Cooper's Limitless is at three.
Was the singer unknowingly taking counterfeit pain medication?
Roberts had left the band in 2012, due to problems with blood circulation and other health issues.
The popstar turned actress is back in the studio.