After all of these years, George's "Mystery Date" from these photos remains unknown. If this George was a pop star of today, the girl's name would have been plastered all over the tabloids, but things were a bit more private for stars in 1964. Not a lot more private, but a little bit. Here is what George said about his date, which is actually pretty hilarious.
"Her name is Hush-Hush and she's a friend of the family. As you will probably guess from her name, she's Chinese."