The 20-year-old reality star called police after her Ford Taurus was spray painted with obscene language outside her home in Anderson, Indiana.
The incident happened over around the Easter weekend and her house was also pelted with eggs.
It comes after Portwood’s neighbour Jamie Monroe accused her of having an affair with Midas Fields. Monroe has a child with Fields, one-year-old daughter Jaicee.
In the new issue of Star magazine, Jamie told how she threw her boyfriend out of their home, just half a block away from Portwood’s, after catching him with Amber.
Jamie told the publication: ‘Everyone around Anderson knows any guy is fair game for Amber is she gets her hooks in him, even if he’s already taken.’
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Teen Mom star Amber Portwood’s car spray painted with obscene language following ‘affair’