Video from the incident shows an item fly into frame and knock Pugh hard near her right eye during an photo-op with her cast mates.
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The actor snapped as the couple was mobbed in a New York City lobby.
The Last Christmas star said she wants to have "a truthful human-to-human thing" with fans.
The actor said she was "floored" by how "gorgeous" the Aquaman star was when she spotted him on an airplane.