这首歌是由陈奕迅演唱的。
1. 因为在快手广东爱情故事的官方音频中，陈奕迅的声音和演唱风格是非常明显的，可以确定这首歌是由他唱的。
2. 陈奕迅是一位知名的华语歌手，他的歌曲风格多样，而且在歌坛有着广泛的影响力，因此他唱这首歌也是符合他的音乐风格和知名度的延伸。
Answer: The song "快手广东爱情故事" is sung by Eason Chan.1. It can be determined that Eason Chan sings this song because his voice and singing style are clearly evident in the official audio of "快手广东爱情故事".2. Eason Chan is a well-known Chinese singer with a diverse musical style and a wide influence in the music industry. Therefore, it is consistent with his musical style and popularity for him to sing this song.
