Bradley Cooper has joined Lady Gaga on stage in a surprise performance of the hit song 'Shallow' from A Star is Born at the MGM Grand Las Vegas. Although 'A Star Is Born' didn't do so well in the awards arena, going up against another powerhouse of a movie Bohemian Rhapsody, this video shows how strong the chemistry is between these two very talented people and why that will insure that the movie will stand the test of time. Wiping away tears Gaga and Bradley Cooper show the true raw emotion tha