The 30-year-old \'Let Me Love You\' singer was believed to be the father of ex-girlfriend Jessica White\'s child in early 2009, resulting in his payment of over USD 575,000 in custodial support, reported TMZ online.
It was later revealed through a paternity test that Ne-Yo was in fact not the biological father of the child, which led to another legal battle.
Ne-Yo and his ex-girlfriend eventually reached a settlement which blocked both parties from discussing details of the situation with the media.
Earlier this year, Ne-Yo spoke about the incident for an interview on VH1\'s Behind the Music.
White has now accused Ne-Yo of failing to honour their agreement and defaming her character.
White has reportedly hired attorney Gloria Allred to represent her, claiming that Ne-Yo\'s actions resulted in \"vomiting and hair loss\".
She is seeking to settle the matter amicably and out of court.
Ne-Yo is currently gearing up for the launch of a 2013 arena tour.