Jennifer Lopez to Judge -- Let My Kids Cross the Border

Jennifer Lopez desperately wants to bring her children on her upcoming world tour with Enrique Iglesias -- just one problem ... the kiddies are not allowed to cross California state lines.

When J.Lo and her soon-to-ex husband Marc Anthony filed for divorce -- the judge ordered both sides to keep Emme and Max within the confines of Cali unless they get permission from the court.

So J.Lo has filed documents ... explaining that both she AND Marc are about to embark on separate concert tours ... and they both want time with the kids while on the road.

In the docs, Lopez says she and Marc will be able to work out the scheduling.