Mark Ballas Taken To Hospital After Bad Car Accident

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FILE - In this Oct. 10, 2013 file photo, dancer Mark Ballas arrives at the launch for Martell Caractere Cognac at The Paramour Mansion in Los Angeles. On Thanksgiving, Ballas and Derek Hough, professional dancers from "Dancing with the Stars," were posting #ThanksgivingDanceWars Instagram videos where they were choreographing dances with their families. The videos went viral. (Photo by Paul A. Hebert/Invision/AP, File) | Paul A. Hebert/Invision/AP

Mark Ballas was in a bad car accident Monday afternoon and ended up in an L.A. hospital ... TMZ has learned.

We're told Mark was driving on an L.A. street, in the process of turning right, when another car was speeding in his lane, couldn't stop in time and slammed into his back right side.

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