Celebrity Birthdays for Tuesday June 21 – ‘Idol’ Winner Kris Allen and Prince WilliamCelebrity Birthdays for Tuesday June 21 – ‘Idol’ Winner Kris Allen and Prince WilliamCELEBRITY BIRTHDAYS (6/21/11): Kris Allen - 26 The winner of the eighth season of "American Idol", thanks to him being way less scary than Adam Lambert.mikemike