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Electric Youth!

1/15/2010 6:05 AM PST BY TMZ STAFF
Here's Baby Gaga aka Ke$ha, that chick that mouths the words to the song "Tik Tok," in NYC on Wednesday (left) -- and '80s teen pop sensation Debbie Gibson back in the day (right).

Neither one is Lady Gaga.

We're just sayin'.

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