US fast food chain Taco Bell have seriously irked rapper 50 Cent by going public about a charity collaboration - before Fiddy himself knew about it.

The chain offered to make a charity donation if he agreed to change his name for a day. The reason for the name change was to coincide with a promotion based around their value meals, and suggestions were '79', '89' or '99 cents'.

If Fiddy, real name Curtis Jackson, had gone into a Taco Bell and ordered a meal using his new name, Taco Bell would have donated $10,000 to a charity of the rapper's choice.

However, a spokesman for him said yesterday that it was a 'sleazy and ill-conceived publicity stunt', with Jackson himself adding: "When my legal team is finished with them, Taco Bell is going to have a new corporate slogan: 'We messed with the bull and got the horns!'".