Bradley Cooper's best acting performance is "A Star is Born". He was fabulous in and starred alongside Lady Gaga who was wonderful as well. The two together had a lot of energy and electricity between them which won awards and is forever in the hearts and minds of those who watched the movie.
Bradly Cooper also helped direct the movie which made it even better. He is a talented actor and "A Star is Born" was not his first movie...just his best. He also sang with Lady Gaga in it and that was amazing. He is not a natural singer and just to do a decent job took a year of singing classes for him. Still, it was very touching and added icing onto the cake of the movie.