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According to a US report, the Hunger Games actor might be required to appear in court if he does not file the necessary documents or attend the scheduled hearing on January 12.
The court has also warned Liam that it will dismiss his divorce if he fails to "take the appropriate steps in your case."
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Liam and Miley announced their split back in August, with Liam filing for divorce a few weeks later citing "irreconcilable differences".
Both Liam and Miley have moved on, with Liam allegedly dating Australian actress Maddison Brown, and Miley starting up a relationship with her longtime friend Cody Simpson after a brief fling with Kaitlynn Carter.
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