Will Showtime's new ''Secret Diary of a Call Girl'' escort Billie Piper to stardom? It's too soon to tell, but in the movies, playing a prostitute is often a good career move, as these memorable on-screen trick-turners prove
Julia Roberts, Pretty Woman
Originally, Pretty Woman was supposed to be a gritty tale of a Hollywood Blvd. streetwalker. Instead, thanks to sitcom maven Garry Marshall and the toothy, megawatt smile of its starlet, the film became a Cinderella tale of cinema's most squeaky-clean hooker (Roberts, in the role that marked her own Cinderella transformation into Hollywood's most popular actress) and the bemused tycoon (Richard Gere, this time on the john side of the transaction) who rescues her and whom she rescues right back.