Which innovative product marketing strategy did Kylie Jenner use to launch her cosmetics line in 2015, contributing to her billion-dollar valuation?

In today's celebrity-driven market, personal brands have transformed into billion-dollar empires. Kylie Jenner's journey from reality TV star to cosmetics mogul represents one of the most remarkable product marketing success stories of the digital age. This trivia question explores how her innovative approach to product marketing and consumer engagement disrupted traditional beauty industry paradigms and created a blueprint for celebrity entrepreneurs worldwide.

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Limited-release 'Lip Kits' promoted exclusively through her personal social media accounts, creating artificial scarcity
Traditional television advertising campaign featuring other Kardashian family members
Department store partnerships with Sephora and Ulta for exclusive in-store product demonstrations
Celebrity-endorsed subscription boxes featuring sample-sized versions of her products