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'Oh, let's cut there,' the film's director Alex Hardcastle was heard saying in the background.
Rebel also shared a photo of herself with the British director and gushed about him in the caption.
Work it! Rebel's slimmed-down figure was on display in a cheerleading uniform as she danced to pop hit 'C'est la vie' by Irish girl group, B*Witched
'The smooth British voice you can hear on this is that of our director Alex Hardcastle - who's absolutely crushing directing Senior Year!' she wrote.
'We're at the end of the marathon right now…had a few issues this week but c'est la vie! We're such a strong team.'