"Teen Mom" Amber Portwood isn't just an alleged baby daddy beater ... she's also a song murderer -- 'cause last week the 20-year-old butchered a 3OH!3 hit after admitting (on tape) that she was drunk.
TMZ obtained footage of Amber (shot last week) rocking out to the song, "I'm Not Your Boyfriend Baby" -- showing a particular penchant for the lyrics, "These children learn from cigarette burns ... fast cars, fast women and cheap tricks."
During the jam session, a stumbling Amber -- who was charged with domestic violence and battery yesterday -- says to the camera, "I'm drunk" ... then moments later says, "Possibly drunk."
Amber should be more careful around cameras -- after all, officials in Indiana have stated that they launched their domestic violence investigation only AFTER they saw her hit her baby daddy on the MTV reality show.
'Teen Mom' Amber
Totally Tone Deaf
11/19/2010 3:43 PM PST BY TMZ STAFF
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