Which celebrity launched a smartphone in 2013 that sold fewer than 500 units and was called one of the worst tech product failures of the decade?

Behind the glamour and success of celebrity product endorsements lies a graveyard of spectacular failures. While some stars like Kylie Jenner and Rihanna have built billion-dollar empires, others have crashed and burned in the product development world. This trivia tests your knowledge of infamous celebrity product failures that cost millions but failed to resonate with consumers. Can you identify which famous person's product ambition became a notorious case study in what NOT to do?

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Lady Gaga's 'Heartbeats' Headphones
Alicia Keys' BlackBerry Creative Director Role
Will.i.am's 'Puls' Smartwatch
Katy Perry's 'Prism' Smartphone