Hugh Grant, the English actor, was arrested in Los Angeles after being caught in a compromising position with a prostitute. Elizabeth Hurley, his girlfriend of the time, is an English actress, most famous for having the gall and the figure to wear a dress made mostly from safety pins.
Hugh Grant clearly forgave Helen Fielding this allusion, as he went on to play Daniel Cleaver in both Bridget Jones films.
The famous misquote "Hell hath no fury like a woman scorned" comes from William Congreve's play, The Mourning Bride:
Heaven has no rage like love to hatred turned,
Nor Hell a fury, like a woman scorned.