Today is Bruno Mars’ 33rd birthday, and he wanted to make it special for himself. Therefore, he paid a singer as famous as him to sing happy birthday to him. Not just any musician, but Ed Sheeran. Since it is his special day, he personalized the tune just for him. Therefore, Sheeran had to sing it with the proper amount of uptown funk. If you are paying someone to sing for you, once is just not good enough! For one night Sheeran was Mars’ bitch and we get to enjoy it!