Poor little bitch girl / Jackie Collins.

Enhanced descriptions from Syndetics:

Three twenty-something women, one hot rich guy, two mega movie stars, and a devastating murder: Poor Little Bitch Girl has it all.

Denver Jones is a hotshot twenty-something attorney working in L.A. Carolyn Henderson is personal assistant to a powerful and very married Senator in Washington with whom she is having an affair. And Annabelle Maestro--daughter of two movie stars--has carved out a career for herself in New York as the madame of choice for discerning famous men. The three of them went to high school together in Beverly Hills--and although Denver and Carolyn have kept in touch, Annabelle is out on her own with her cocaine addicted boyfriend, Frankie.

Then there is Bobby Santangelo Stanislopolous, the Kennedyesque son of Lucky Santangelo and deceased Greek shipping billionaire, Dimitri Stanislopolous. Bobby owns Mood, the hottest club in New York. Back in the day he went to high school with Denver, Carolyn and Annabelle. And he connected with all three of them. Frankie is his best friend.

When Annabelle's beautiful movie star mother is found shot to death in the bedroom of her Beverly Hills mansion, the five of them find themselves thrown together . . . and secrets from the past have a way of coming back to haunt everyone. . . .