diva vs leading lady

diva

noun
  • Any female celebrity, usually a well known singer or actress. 

  • A person who may be considered or who considers herself (or by extension himself) much more important than others, has high expectations of others and who is extremely demanding and fussy when it comes to personal privileges. 

leading lady

noun
  • The type of conventionally beautiful and approachable woman who is perceived as being capable of playing female lead roles in movies or other productions. 

  • A woman who does or can play the lead role in a movie, play or other production; a woman who frequently plays such roles. 

How often have the words diva and leading lady occurred in a corpus of books? (source: Google Ngram Viewer )