Music legend, Tony Bennett, is turning 90 this year! The "I Left My Heart in San Francisco" singer celebrated with a star studded party.  Guests included some big stars, including Lady Gaga, Michael Buble, Stevie Wonder and many others who showed up at Radio City Music Hall to honor Tony Bennett for his 90th birthday. Bennett was honored as a true icon and legend. This is one Hollywood party we would have loved to attend.