It only took three days, but Naomi Campbell is at the center of another controversy involving a cell phone -- this time, not her own.

It only took three days, but Naomi Campbell is at the center of another controversy involving a cell phone -- this time, not her own.

TMZ has learned that an employee in the Department of Sanitation was reprimanded -- and faced possible suspension -- for trying to take a picture of the supermodel with a cell phone camera while she was working inside. Sanitation Department staff, we're told, have been asked not to interact with Campbell, and workers exiting the building have been tight-lipped about Campbell's stint scrubbing their locker room. A Sanitation rep did not respond to a request for comment.

Meanwhile, Naomi arrived for her penultimate day of custodial wizardry in yet another fetching ensemble -- including some color, finally. She sauntered past photogs in a fur jacket, purple blouse, wide-legged trousers, and burgundy boots.

It could be an interesting day for Campbell, as she's been earmarked for locker-room duty -- the men's locker room, that is.