'Gossip Girl' Star to Ex -- Don't Run For the Border

Another "Gossip Girl" star in the news. Kelly Rutherford is apparently worried that her ex might leave the country with the couple's two children, Hermes and Helena.

We got our hands on docs filed yesterday in their custody war -- both Rutherford and her estranged hubby Daniel Giersch have agreed he will ante up his visa and visa application to her lawyer within a week.

The docs don't say why this is happening, but the application is telling -- it seems Giersch may have plans to leave the country, smack in the middle of their ongoing fight over the kids. Giersch is from Germany.