Lisa Marie Presley -- Baby, You're Sued!

Forget Lisa Marie Presley -- her nanny is suffering from postpartum depression and she's suing Elvis' daughter.

Christine White has filed a lawsuit against Presley, claiming she became the postpartum caregiver several weeks after Lisa Marie gave birth on October 7, 2008.

White complains she was not given meal breaks and forced to work 7-days a week without getting O.T.

And get this -- she didn't get a 10-minute rest time!