Fame may be the most powerful motivation for ordinary folks to seek a career on reality TV. But it has its downside, as Teen Mom 2's Leah Messer found out on the evening of Feb. 19 — when she was allegedly beaten by three women while she and fiancè Jeremy Calvert were leaving the Marquee Cinemas in South Charleston, W. Va.

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But Leah, 19, won't let the lady thugs get away with it. An insider tells OK!, "We know who they are." Another source says, "Leah is going after them. She wants justice and she'll stop at nothing to make sure it's done."

A source says it started when Leah was exiting the theater with Jeremy and an older woman began following her and calling her names. The 40-something assailant became agitated when Leah opened her car door.

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FOR MORE ON HOW LEAH MESSER IS FIGHTING BACK, PICK UP THE NEW ISSUE OF OK! — IN STORES NOW!

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