Funny guy! Usher showcased his irreverent sense of humor when he paid a special birthday tribute to his son Usher Raymond V. Taking to his Instagram on Friday, the 43-year-old singer shared a hilarious image of a sonogram with a middle finger being pointed up from the womb. “Guess WHO!! Been a rebel,” Usher captioned the silly snap. “Happy 14th URV ‘Cinco’.”