Arnie Klein Shut Down in Jackson Court

Michael Jackson's good friend and doc Arnie Klein was formally shut down in court Friday, when the judge ruled he has no legal right to raise concerns about the welfare of Jackson's 3 kids.

You'll recall Dr. Klein's lawyer, Mark Vincent Kaplan, showed up in probate court early on and said his client had concerns about the kids.

According to court docs obtained by TMZ, the judge ruled Klein had no legal "standing" because there's a "conclusive presumption" Jackson and Debbie Rowe are the parents of the two older kids.

The court also found there is "no legal mother" of Prince Michael Jackson, II -- aka Blanket.