From the little I know about George Jessel, this didn't sound like his M.O. to me, so I checked it out. In her autobiography Shirley Temple discusses this event during a part of the book that recounts events in the fall of 1948. At this time she was 20 years old.
She mentions Jessel having seen the rushes from a movie called Mr. Belvedere. Shirley Temple appeared in a movie called Mr. Belvedere Goes to College that came out in 1949.
Shirley Temple had been married at the age of 17. Although Jessel was 30 years older, Temple was not an innocent little child when this alleged event happened. He may be guilty of sexual harassment but it is wrong IMHO to accuse him of pedophilia.