In honor of "The Real Housewives of Orange County" 20th anniversary, we're taking you behind the infamous OC gates -- with the ladies whose oranges have been put on blast ... Can you guess the cast members?!

Noella Bergener, Tamra Judge and Gretchen Rossi look HOT AF -- but, "that's just our OPINION!!!"

Hit up the gallery and put your skills to the test!