Uh oh! Trouble is brewing for Pitbull and Kesha. The duo responsible for one of the biggest songs so far of 2014, 'Timber,' is being sued for copyright infringement! 

Songwriter Lee Oskar is seeking 3 million dollars claiming that the harmonica part in "Timber" was taken from his song "San Francisco Bay"

Take a listen to the two... 

[Image via Getty Images]

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