Lately we've been seeing Fergie taking her runs and workouts outdoors, which is cool. I like to see a celebrity exercising outdoors. I am chuckling about her giant headphones, but what's with that crazy belt?
Fergie is sporting a 6-Bottle Terminator FuelBelt by FuelBelt ($32.26). While she has the 6-bottle (7 oz flasks), you can get also them in 2-8 bottle sizes as well. Typically people use these sort of belts when they are training for an endurance event like a marathon. You can fill a few flasks with water and a few with gels if you want.
It doesn't really look as though Fergie is training for a marathon (maybe a walk-a-thon), but I could be wrong. She could also just be really, really thirsty. My guess, however, is that Fergie's trainer is having her wear one for added weight (similar to a weighted vest) during her walks -- This way she is killing two birds with one stone, a few added pounds and thirst quencher (or fuel boost). You can do the same, so buy it from GotBody.com.
To see more pics of her out on her walk wearing the FuelBelt,