A Night Like This by Julia Quinn- "Anne Wynter, a governess with some dark secrets in her past, is tempted by the dangerously handsome Daniel Smith-Smythe, Earl of Winstead, who relentlessly pursues her despite her social station."
I recommend this book to all women! I've read it over 20 times no exaggeration. Penelope Featherington is a glorified spinster at age 29. She goes unnoticed in the ballrooms of the ton in London, making her a perfect person to hear all the gossip among the nobles. She is also hopelessly in love with Colin Bridgerton, her best friends older brother, and has been for over a decade.