A. Alice Cullen told her when Edward wasn't looking.!! B. She tricked Jacob into telling her at La Push beach.!! C. She read it on a piece of paper she found on the floor.!! D. She read stories online and realized Edward was a vampire.!! E. Edward confessed it to her while driving back home from Port Angeles.!!
Bella Swan and Edward Cullen are both vampires in Stephanie Meyer's Twilight series of novels. Bella first arrives in a suitably innocent form to her father's town in Washington, called Forks, hoping to meet the Cullen family.
She quickly falls in love with Edward, a fine specimen of a man she thinks, but then discovers all the Cullen (coven) family are vampires. Because of her love for Edward, she wants to be changed into a vampire herself. In this form of fiction, there are very many fans. I suspect that the already long series is not yet over!