Malvagna, 27, was charged with assault and harassment after the incident at Pier 17 on June 18.
Rexha posted a video and pictures of her injuries, including a bruised eye and a cut that required stitches, after she was hit in the face.
Malvagna's attorney blamed the incident on a TikTok trend in which people give celebrities their cellphones to take a selfie.
But a witness at the concert said Malvagna thought it would be funny to hit Rexha with the phone.
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