Billie Reed is a fictional character from the NBC soap opera Days of Our Lives, originally and most recently portrayed by Lisa Rinna. Created by writer Sheri Anderson, Billie did not know her mother was Kate Roberts until a court hearing after being accused of murdering her father, Curtis Reed. Billie's relationship with Bo Brady was famous to the character, and was a key reason she became such a popular character. The two share a daughter, Chelsea Brady, who was originally believed to be stillborn.