Jenelle Evans was arrested on Thursday after an alleged assault involving her ex-fiance's new girlfriend.

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According to reports, the Teen Mom 2 star was arrested for 3rd degree assault and battery after she reportedly three a glass cup at Nathan Griffith's girlfriend, Jessica Henry, whom he began dating just days after his engagement to Evans was called off.

“Jenelle told Nathan to come get his stuff out of their house because she is moving in two weeks and he brought his new girlfriend, Jessica Henry,” an insider revealed to Radar Online on Thursday. “This really made Jenelle mad. They ended up getting in a fight and she threw a glass at Jessica. So Nathan called the cops.”

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Radar's source alleged Evans believes she was set up by Griffith, and said, “he provoked her. He is only trying to make her look bad.”

Evans and Griffith have both been arrested this year after alleged assaults on one another. First, Griffith was arrested in March after he reportedly assault Evans, and ripped off her engagement ring (the incident aired on last night's new episode of Teen Mom 2). Months later, it was Evans who was taken into custody after she allegedly attacked him. In both cases, however, charges were ultimately dropped.

For more Jenelle Evans, tune into Teen Mom 2 season six on Thursdays at 10 p.m. on MTV.

Tags: Jenelle Evans Nathan Griffith jessica henry MTV Reality TV Teen Mom 2 arrest