David Walliams delighted fans after sharing a rare photo of his adorable mother, Kathleen, on Tuesday.Taking to his Instagram, David posted a sweet photo of the mother-son duo, which saw him affectionately wrap his arm around her shoulder as they both smiled for the camera.MORE: David Walliams shares cute photo of his 'true love'Simply captioning the touching image, "Mum", David's fans were quick to comment on the striking similarities between the pair.WATCH: David Walliams films inside