Piper Perabo Injured in Accident on TV Show Set

TMZ has learned actress Piper Perabo was injured yesterday in an accident on the Toronto set of her TV show "Covert Affairs."

0819_piper_parabo_getty_EX
Reps from the USA Network tell TMZ Perabo sustained an injury to one of her knees. We're told she's being treated and should make a full recovery.