This according to TMZ.com:
Angelina Jolie has returned to the U.S. with her kids, and the reason is simple ... she was ordered to do so by the judge in her divorce case.
Angelina was shopping Sunday in WeHo with 3 of her kids at Whole Foods.
According to court docs, obtained by TMZ, Angelina was ordered to return with the kids Saturday. According to the judge's order, Brad Pitt has a right to custody of the kids for no less than 4 hours every other day on school days and 12 hours every other day on non-school days.
Brad and Angelina are due back in an L.A. court this week to hammer out more custody issues. The judge is waiting for a custody evaluation by at least one psychiatrist. In the meantime, the judge indicated he will deal with temporary custody issues while he waits for the report.