The Gladiator star spotted an American couple being mugged as he left a restaurant in the French capital last month.
And although the attacker escaped, Crowe remembered his face and identified him to the authorities.
A witness says, "It happened too fast for him to react but he got a good look at the thug's face.
"He comforted the victims until cops came then he went to a police station and identified a mug shot.
"The mugger was then held in a line-up and Crowe made a positive ID."
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