CSI: MIAMI star David Caruso is facing more legal woes - his former nanny is suing the mother of his children.

Maria Vianey Guadron filed suit against the actor's ex-girlfriend Liza Marquez earlier this week (beg01Jun09) claiming wrongful termination and intentional infliction of emotional distress.

Guadron cared for the couple's two children before the pair split in 2007 and then allegedly went to work solely for Marquez.

The nanny says she was fired after she refused to sign a confidentially agreement which she claims would have barred her from speaking about matters discussed in private with Marquez.

Guadron is a potential witness in an ongoing custody/palimony battle between the former couple and she insists signing the document would have prohibited her from testifying in the case, according to website TMZ.com.

Guadron has asked for the Los Angeles County Superior Court to grant her unspecified damages.

But Marquez's lawyer has spoken out against the lawsuit and denied the allegations.

Debra Opri tells RadarOnline.com, "Guadron has been employed by the same employer, David Caruso, and still is. He has paid Guadron all along, and still does as she still works for him. David Caruso is harassing my client through the nanny, and he better be ready to be named as a defendant.”

A representative for Caruso could not be reached for comment as WENN went to press.

Caruso and his ex are locked in a bitter legal dispute after Marquez filed a suit against the actor, claiming he had failed to pay her $1 million (£666,000) as part of a split deal.

The former couple shares children Marquez, three, and Paloma, 20 months.