If anyone doubts Graham Norton's position as chatshow king, a look at tonight's opening line-up should set them straight. While Alan Carr has the solid if unspectacular likes of Lionel Richie, Jessie J and Nick Grimshaw over on Channel 4 (10pm), Norton's sofa dwellers - Denzel Washington, Gemma Arteton and new Doctor Who Peter Capaldi - offer real big-name clout. Music, meanwhile, is provided by the endlessly emoting George Ezra, whose croaky folk has proved inescapable this summer.

Comedian takes Lionel Richie joke to new heights

Every day of this year's Edinburgh Festival Fringe, singing legend Lionel Richie will be performing a free gig on Arthur's Seat. Before fans go Dancing on the Ceiling, though, it's actually not the American but a guy called Barry Ferns, who has legally changed his name to Lionel Richie.

The last time R&B superstar Rihanna was on a Jonathan Ross chat show, back in December 2009, the host compared her low-cut dress to a curtain. Hopefully Ross will behave a little more suavely tonight as he talks to the Barbadian about her current musical projects and her appearance alongside Liam Neeson in a soon-to-be-released Hollywood blockbuster called Battleship. Further down the bill, there's an interview with Lionel Richie, while Imelda Staunton and Michael Ball will discuss their popular revival of Stephen Sondheim's Sweeny Todd, currently showing in the West End.