Bill Clinton just out-Clinton'd himself -- posing with two famous porn stars in Monaco moments ago ... and one of them's a real up-and-comer.Clinton's in a Monte Carlo casino right now for a special "Nights in Monaco" gala event -- and several celebrities are in attendance ... including Diane Kruger, Joshua Jackson ... and a BUNCH OF PORN STARS.The two porn stars on Bill's arms are Tasha Reign (left) and Brooklyn Lee -- AVN's "Best New Starlet" in porn. Brooklyn -- who just posted the pic on her Twitter account -- also just won the award for "Best Sex Scene" in "Mission Asspossible." As for Tasha's film credits ... those include "Baby Got Boobs 8" and "Farm Girls Gone Bad."Our guess -- Bill did not have sexual relations with these women. What it IS Bill...