SOPHIE & JOE STILL GRINDING CUSTODY AXES!

JOE JONAS and Sophie Turner’s split just got even nastier after the actress asked a judge to “reactivate” their divorce case when property and child custody mediation failed.

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Even though both have moved on romantically, “all these promises they verbally made have not been fulfilled, creating a real mess,” an insider tattles.

According to the mole, Joe, who’s making sweet music with American Idol stunner Stormi Bree, 33, is still spitting mad because Sophie slapped him with a kidnapping charge in September.