You might think artists like Katy Perry and Rihanna are popular, but they are dwarfed by the mega-marketing machine known as Lady Gaga. When it comes to overall sales, internet exposure, and worldwide recognition, Lady Gaga is a juggernaut. For example, Nikki Minaj might show up to Japan and have a few fans waiting . . . → Read More: Why Lady Gaga is the Real Deal
