An overseas student who repeatedly sexually abused a 13-year-old girl under the guise of a "marriage" performed in the Hunter Valley has pleaded guilty to the crime.

The 26-year-old Lebanese man, who cannot be named, was visiting Australia on a student visa when he "married" the underage girl during an Islamic ceremony in the Hunter in January.

After the ceremony, he repeatedly sexually abused the girl until he was arrested earlier this year.

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