Jessie brought along her French bulldog Jackson to the studio in Manchester last year but the young pup struggled with life backstage.
Sir Tom Jones returned from filming to find that's Jessie's dog had left him a surprise in his dressing room.
A source said: "He was very young and hadn't be toilet trained at that stage."
But fortunately for Jackson – and Jessie! – Sir Tom wasn't too upset.
The source added: "Tom forgave him though, as he grew quite attached to him himself."
They do say never work with kids and animals...