It wasnt a surprise freebie she might have hoped for.

A New York City woman is suing fashion retailer Zara after allegedly finding a dead mouse sewn into a dress hem and contracting a rodent-born disease.

In court documents filed Friday , Cailey Fiesel claims she found the rodents rotting carcass after noticing a disturbingly pungent odor while wearing the dress on Aug. 16.

She noticed what she believed to be a loose string brushing against her leg. When reaching for it, she felt an unusual bulge and a tiny paw scraping against her skin, her lawsuit claims.