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We're gaga for Ke$ha! Watch out, Lady.

Never heard of her? That better change - Ke$ha made music history this week! The sexy singer's debut album, Animal, is already number one on the Hot 100 and Billboard 200, but it's her single "TiK ToK" that's getting all the attention...

Last week, Lady Gaga's "Bad Romance" made chart history for getting the most weekly plays EVER: 10,859, according to Nielsen BDS.

But now Gaga's been dethroned! This week, "TiK ToK" established a new record of 11,224 plays. Damn! Does this mean Gaga's been replaced for good?