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Little person porn star Bridget Powers -- who goes by "Bridget the Midget" in her movies -- got in a nasty fight that ended with her in handcuffs and her BF with a stab wound ... in the leg.

Law enforcement sources tell us they were called to a home in Vegas early Wednesday after a neighbor heard screaming and breaking glass. When officers arrived, they made contact with Powers and discovered she and her boyfriend just finished a vicious spat.

Cops say Powers stabbed him in the leg during the fight ... and he was transported to a local hospital for non-life threatening injuries. Unclear if his injury is below or above the knee.

She appeared in her first adult film in 1999, and by her own account has appeared in more than 50 projects since then. She's also made appearances on "S.W.A.T." and "The Surreal Life."

Bridget now faces charges of domestic battery with the use of a deadly weapon, burglary while in possession of a deadly weapon and assault with a deadly weapon ... all felonies.