The newly-divorced comedian shocked a live audience during the filming of his American show by saying the singer gave him "ass-ache". The 37-year-old star was at Solar Studios in Los Angeles on 15.07.12 filming this week`s instalment of his chat show `BrandX` for network FX. While he refused to go into depth about his legal union to the 27-year-old singer after they announced their split in December, he had now admitted that she was irritating. An audience member told the Daily Star newspaper: "Russell was bantering with the audience, in particular a couple called Curtis and Katy. He got onto the subject of their sex life. Katy was giving as good as she got. "Then, all of a sudden Russell shouted: `Anyway, enough of you. I`ve had enough ass-ache from people called Katy in the last year.` The source continued: "It was obvious he meant Katy Perry. The whole room gasped. I think it took a couple of seconds for what he`d said to sink in. "He then laughed and shouted: `Oh no, there might be a journalist in the room.` He shrugged his shoulders and murmured: `Oh well,` before moving onto his next subject."