Which celebrity's smartphone app, launched in 2011, was discontinued after just one month due to poor sales and negative reviews?

Even the biggest celebrities aren't immune to product launch disasters! Behind the glamorous endorsements and fancy marketing campaigns, some famous people have experienced spectacular failures when launching their own products. Test your knowledge about these high-profile product flops that prove even star power can't guarantee success in the retail world.

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Lady Gaga's 'Gagaville' Social Network App
Will.i.am's 'Puls' Smartwatch
Alicia Keys' 'BlackBerry Creative Director' Phone
MC Hammer's 'DanceJam' App