Lady Gaga made an appearance on The Graham Norton Show as part of the promotional tour for her upcoming movie A Star Is Born. Joined by her co-star Bradley Cooper, as well as Ryan Gosling and Jodie Whittaker, on the red couch, Gaga chatted about her first major acting role and even played a rendition of the Doctor Who theme on a theremin. 

Watch Lady Gaga and Bradley Cooper on Graham Norton below...