Lady Gaga has made a surprise appearance with U2, joining them at the Las Vegas Sphere to perform a rendition of ‘Shallow’.The moment took place during their show at the new $2billion venue last tonight (October 25), when the Irish rock veterans played the latest of their ongoing residency shows in Las Vegas.After performing their 1991 track ‘Tryin’ to Throw Your Arms Around the World’, the band were then joined on stage by Lady Gaga, who joined them for a rendition of ‘All I Want Is You’, taken from their 1998 album ‘Rattle and Hum’.The highlight of the evening came after, however, as the singer – wearing a leather jacket and sunglasses – performed an amped-up version of her song ‘Shallow’.Written for the 2019 film A Star Is Born, the original track is performed by Gaga and her co-star in the film, Bradley Cooper. It later went on to win an Oscar for Best Original Song at the 2019 awards.For last night’s version, however, the singer made the emotive track more upbeat, and Bono contributed vocals.