Which celebrity is widely credited with revolutionizing the celebrity retail business model by creating the first billion-dollar celebrity brand through strategic product development?

Many celebrities have ventured beyond their primary careers to build impressive retail empires and product lines. While celebrity endorsements have existed for decades, certain famous individuals revolutionized how personal brands could transform into full-fledged retail businesses. This question explores which celebrity pioneer fundamentally changed the landscape of celebrity retail branding with their groundbreaking approach to product development and brand identity.

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Jessica Simpson with The Jessica Simpson Collection
Rihanna with Fenty Beauty
Martha Stewart with Martha Stewart Living Omnimedia
George Foreman with the George Foreman Grill