The fast-food chain took out a full page ad in the Sun and Metro newspapers which shows an empty bucket of chicken with crumbs spilling out.
Instead of having KFC logo on the side, the letters have been switched around to read "FCK".
The chain was forced to close hundreds of stores this week following a problem with its chicken supplier.
Almost 700 of its 900 UK outlets have since reopened.
In the ad, KFC said: "A chicken restaurant without any chicken. It's not ideal.
