Poor, poor Kourt.
The source says of Disick:
Katy Perry had a little trouble Roaring at this year's NRJ Music Awards.
She had barely begun performing her hit song when it became obvious to the crowd that Katy was NOT in sync with her music track and background visuals!
The problems were so noticeable, the host of the show actually stopped Katy's performance mid-song and apologized!
Katy restarted the song, performing seemingly without monitors or backing tracks because the audio quality seems significantly worse!
But gurl is a total pro and took it all in stride, finishing her Roar with a smile!