Welsh singer Charlotte Church slapped a guest during recordings for her TV chat show, after he insulted her family. The Voice Of An Angel beauty, 20, was dismayed when British comedian Johnny Vegas arrived for his interview in an allegedly drunken state. An audience member tells British newspaper The Sun, "It was like watching a car crash. Johnny was off his face and took every opportunity to wind her up - she didn't have the experience to keep him under control." When Church reminded Vegas that they had performed karaoke at her mother's hotel last year (06), he replied, "Yes, and I s**gged your grandma too." He went on to slam Church's transformation from child soprano to pop star: "I listened to your album and it was s**t." Church finally snapped and shouted, "Shut the f**k up," and slapped a clearly shocked Vegas."