Spoiler alert: she's pretty good!
In the Karl Lagerfeld directed-film, the British model plays an Austrian hotel maid and Pharrell's an elevator operator who become royalty in a fantasy sequence.
They sing, they waltz and they break it down, all while wearing super fancy clothes, of course.
The film's premiere is one night before the big Chanel show in Salzburg, which Cara and Kendall Jenner are modeling in instead of the Victoria's Secret show.
Cara and Kendall have already been documenting their trip to Austria on Instagram, including this beautiful mountaintop video with a view high above the clouds.
Do you think Cara's a good singer or should she stick to her day job?
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Gallery | Cara Delevingne's Best Faces