By Ian Youngs
Music reporter, BBC News, Cannes
Katy Perry picked up the best international album prize
US singer Katy Perry has been wrongly handed one of the main prizes at France's main music award ceremony.
Perry collected the trophy for best international song at the NRJ Awards in Cannes, thinking she had won - but it was intended for Rihanna for Disturbia.
Host Nikos Aliagas admitted the error at the end of the show.
Perry did legitimately scoop the best international album prize, while other winners included Enrique Iglesias, the Pussycat Dolls and the Jonas Brothers.
French singer Christophe Mae won two awards - for best French song and best French male - while Mylene Farmer won best French album.
The winners at the ceremony - the French answer to the Grammys or the Brits - were voted for by listeners of radio station NRJ.
Perry was among the international stars at the annual event, which was celebrating its 10th birthday.
Coldplay singer Chris Martin performed a solo song, while US R&B star Akon, soul icon Seal and pop chart-topper Duffy were among the other performers.
The NRJ Awards was the most glittering event of the opening day of the annual Midem music industry conference in Cannes.
French kisses and faux pas - read our NRJ review here.