Lady Gaga is undoubtedly the biggest pop star on the planet right now, however, there are a growing number of music stars, celebrities and naysayers who are sticking the boot in and giving Gaga a good verbal lashing. From Grace Jones to M.I.A. to everyone's least favourite Republican newsreader Bill O'Reilly, Gigwise takes a look at all the Gaga dissers...
From Grace Jones to Donny Osmond...
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