Ke$ha starts her new music video for "Take It Off" looking cleaner than she's ever looked -- but it doesn't take long for the Jack Daniels lovin' pop star to end up covered head-to-toe in paint!

Check out the vid, question is ...

Ke$ha also performed at the Casio "Shock the World" event in Manhattan yesterday -- the singer is a "brand ambassador" for the company. Check out the performance pics!

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