ORBIT GUM GIRL I SEE LONDON, I SEE FRANCE ...

Vanessa Branch OrbitVanessa Branch -- the chick from the Orbit gum commercials -- showed off a different side (and front ... and back) than we're used to seeing by wearing an exposing sheer dress in NYC on Tuesday.

Fabulous!

UPDATE: Branch's rep tells us the model wasn't just aimlessly walking the street in her racy outfit ... the pics were taken during a photo shoot for JNBY Clothing.