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' 16-year-old half-sister Lottie has been signed to Storm Model Management.
It is the same modelling agency that Kate started out at the age of 14 with and has guided her supermodel career ever since.
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Lottie's potential as a model was first spotted when she appeared as a bridesmaid at Kate's 2011 wedding. However, as she was just 13 at the time, she wasn't allowed to be signed up to an agency and settled with test shoots with Storm.
On Thursday, as she turned 16, her signing was officially announced.
The teenager took to Twitter to proudly announce her news, posting a picture of her portfolio page on the Storm website. "Wot u sayin," she captioned the snap.
Lottie's modeling pictures for Storm
Storm then tweeted a close-up picture of Lottie, with "Happy Birthday Lottie, Love Storm" written across it in pink font.
Appearing in the agency's 'New Faces' section, the portfolio features 13 black and white photographs of Lottie. It also lists her height as 5'5", an inch smaller than her elder sister.