I think Lady Gaga because Harry Potter isn't on commercials anymore. And also, Harry Potter isn't on the radio! (example: KISS108, JAM'N 94.5, etc.)
LADY GAGA spof harry potter
That is a hard question but harry potter, or daniel, is way more famous than lady poop-poop.Harry Potter
Lady Gaga but I don't like her so...yeh. But I don't like Harry Potter either..
Lady GaGa is more famous but Teen Top is way better than both of them.
The two have never met ;) There is no mention of any "Lady gaga" in the Harry Potter novels.
Lady Gaga
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Lady Gaga by far
In my opinion, Hermione Granger is more famous, but some peoples opinion is Lady Gaga, which is not in my case.