Halle Berry Will Fight Baby Daddy in Court

1/31/2011 8:05 PM PST

Halle Berry -- Custody War With Gabriel Aubrey

Halle Berry is at legal war with baby daddy Gabriel Aubry ... and she's going to court to protect 2-year-old Nahla.

Halle's rep tells TMZ, "Halle has serious concerns for her daughter's well-being while in the care of her father for any extended period of time and is prepared to take all necessary steps to protect her."

According to the rep, Halle will go to court and has canceled an upcoming film production in New York this week to handle the matter.