2007 ls 460. So about a week ago my Passenger Fog light went out on me. i bought a new pair of bulbs and replaced them and That same light is still not working so clearly its not the bulb. Has anyone else had this problem where one of your fog lights suddenly stopped working? Does anyone know how to diagnose the problem or fix it? definitley something electrical.

Standard electrical troubleshooting is needed. If you have a test light and/or a rmultimeter, you can chase it down. Start at the harness and go from there. Should be pretty simple.

Like Mr. Frog said..... Basic troubleshooting by starting at the fog light and making your way back into the car.
I may add before going too crazy, you may want to reseat the connectors and check the bulb socket for corrosion.

Check the first bulb that you had in there when it stopped working. Maybe it was too much wattage and fried the harness. I had this happen to me on a 2001 GS3.