Which 2019 celebrity product endorsement caused such massive demand that it crashed the brand's website and led to a 600% increase in sales within 24 hours?

Celebrity and influencer product endorsements have transformed marketing strategies in the digital age. One particular endorsement deal created such unprecedented demand that it completely changed a brand's trajectory and set new standards for influencer marketing ROI. Test your knowledge of this iconic pop culture business phenomenon that marketers still study today.

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• Travis Scott's McDonald's 'Cactus Jack' Meal
• Kylie Jenner's Kylie Skin launch
• Rihanna's Fenty Beauty partnership with Sephora
• Selena Gomez's Rare Beauty 'Stay Vulnerable' collection

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