Kirsten Dunst -- 3 Years Protection from Obsessed French Fan

Kirsten Dunst can say au revoir to her #1 French fan -- a judge just extended her restraining order against the 51-year-old man, who allegedly flew to the U.S. multiple times just to sit outside her house.

TMZ broke the story last month ... a judge issued a temporary restraining order against Jean Christophe Prudhon, whom, Kirsten claims, sent her dozens of letters, and even tried to call her directly hundreds of times.

According to Kirsten, Jean also admitted to sitting outside her home in his car 10 times.

But an L.A. judge extended the order today -- requiring Prudhon to stay at least 100 yards away from Kirsten for the next three years.

According to the order, Kirsten's mom -- who Prudhon allegedly confronted during a recent attempt to contact the actress -- is also protected.