"Once a month, you need to cup them, really grab them and give them a good squeeze," she begins as she massages her boobs.
Then the director interrupts to inform her it's actually about balls, not boobs.
"Balls? Little problem...I don't have any balls," she replies.
Then the supermodel starts talking about her ladyparts.
"Vaginas, they are amazing, they rule the world and you should look after yours," Cara begins before getting cut off again.
The video is to promote Channel 4's The Feeling Nuts comedy show, which will be broadcast tonight in London.
Celebs like Hugh Jackman and Ricky Gervais have also posted crotch-grabbing selfies to support the campaign.
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Gallery | Cara Delevingne's Best Faces