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Gordon Ramsay transformed himself into a pensioner to pull a prank on fellow celebrity chef Delia Smith.
The fiery Scotsman, 41, was disguised with prosthetics which gave him a new nose, face shape and hairline so that he could remain incognito while attending one of his rival's cooking workshops.
The disguise - complete with spectacles and cardigan - was so good, Delia, 67, believed Gordon was just an enthusiastic fan and happily posed for a photo with him, reports The Daily Mail.
The 'joke' can be seen on the Hell's Kitchen's star's new Channel 4 show Cookalong Live, which starts tonight at 9pm.