2:05 PM PT -- A rep for Brielle Biermann tells us she has plans to pay the bill in full Wednesday.
Brielle Biermann is being hounded by American Express for allegedly not paying a five-figure credit card bill, and now AmEx is going after her in court.
According to new legal documents, obtained by TMZ, American Express claims Kim Zolciak's daughter failed to pay off a $12,870.25 balance.
The credit card company claims Brielle hasn't been forking over the monthly minimum payment on her Delta SkyMiles Reserve American Express Card.