Nick Jonas was injured late Saturday night while filming a new show … sources with direct knowledge tell TMZ. We’re told Nick was on set when something happened — the sources would not disclose the nature of the accident or injury — but it was serious enough that he was taken by ambulance to a nearby hospital.

He was back for the live show Monday night on “The Voice” and explained he has a cracked rib and some bumps and bruises from a spill on a bike. 

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