By Jen Heger - Breaking Celebrity News Assistant Managing Editor

Yoselyn Ortega, the Manhattan nanny accused of killing the two young kids in her care, had an argument with her employer, Marina Krim, the day before Ortega allegedly brutally stabbed the children to death, Breaking Celebrity News is exclusively reporting.

"Yoselyn told NYPD detectives that she was involved in an epic argument with Marina Krim the day before the children were tragically murdered," a law enforcement source told Breaking Celebrity News exclusively. "Yoselyn also said that when she left at the end of the day before the murders, Marina ignored her when she said good-bye and this made her very, very angry. Yoselyn became extremely animated when she discussed the incident with law enforcement. Yoselyn also said she