Fergie's obsession with Taco Bell could mean free food for you -- if the Black Eye'd Pea ever feels like runnin' for the border after a concert.

TMZ has obtained a letter written to The Dutchess by Greg Creed, President of Taco Bell, offering her an "ultimate after-party" at any local Taco Bell near a stop on her concert tour, where she and her fans can enjoy free Fourthmeals after the concert. All Ferg has to do is contact them a week in advance, and she and the crowd "will be served free Extreme Cheese and Beef Quesadillas for three hours" following one of her shows. Ay, ay, ay!

The offer comes fresh off a video posted by TMZ, showing the "Glamorous" celebrity explaining how she "f**kin' loves" her Taco Bell!