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"Star Trek: Voyager" actress Jennifer Lien is behind bars after cops arrested her for allegedly exposing herself to 3 kids under 13.

We've learned 2 weeks ago Lien was at her Tennessee home when she got in an argument with her neighbor outside her house. She was angry that a small child was crying over a cut foot.

Lien allegedly exposed her breasts and rear end to the 3 neighbor kids. Cops took a report and Lien denied exposing herself. But they didn't believe her and got a warrant for her arrest.

When cops went to Lien's house to arrest her she didn't go down without a fight. Cops say she refused to put clothes on, was carried to the police car and threatened to have them shot and killed.