Safe to say we won't see him on the couch again soon.

It might look like the guests and the audience all have a ball on The Graham Norton Show each week - but wrangling Hollywood stars is no joke for the host. Graham Norton has revealed that Robert De Niro was one of his least-favourite guests ever on his BBC One chat show. The legendary actor was a let-down, Graham said during a talk at the Cheltenham Literary Festival yesterday, and the show was forced to cut some of what he said. “He’s not a storyteller, or very verbal," the West Cork native said. "He’s a benign presence. Last time he started telling a story – he went on and on. “We were all leaning in, willing it to be amazing... then he finally went, ‘why am I telling this?’ Nobody had an answer. We cut it.” Still, that wasn't a patch on what Graham called his worst episode ever - a show in June of this year that featured Sandra Bullock, Cate Blanchett, Rihanna, Sarah Paulson and Helena Bonham Carter. The actors were all there to promote film Ocean's 8 but got a little rowdy. “I felt like the guy driving the bus on a hen party," Graham remarked. “For 45 minutes people were talking over each other and laughing. "They were having a great time but the audience was nonplussed.”