The singer was left stunned when he made the discovery and immediately rang his bandmate Jay MCGuiness to inform him of his find.
He tells Britain's Ok! magazine, "I was moving boxes, I opened the back of the truck and there was an extra box there with a fan inside. The box was made of plastic and she was sweating."
MCGuiness adds, "He called me and told me the story and said: 'Mate, she's so sweaty, she stinks'."