Kelly Marie Monaco was born on May 23, 1976, in Philadelphia, Pennsylvania. Girl grew up in a traditional Italian Catholic household, the third of five sisters. The Monacos relocated from the big city to the rural Pocono Mountain region of Pennsylvania before Kelly became a teenager. Although initially unhappy about the move, she eventually learned to love her peaceful surroundings.

Kelly excelled at sports, including soccer, swimming, tennis, track, and softball, as well as speech, debate and drama during her high school years. Monaco then attended Northampton Community College, where she majored in mass communications for two years, and worked as a lifeguard at the Mount Airy Lodge. With dreams of becoming an actress, Monaco planned her escape from the Poconos.

In 1996, Kelly sent nude photos of herself to Play..boy magazine and was contacted one month later by the men's publication. With her family's approval, she traveled to Chicago for a photo shoot. She became the magazine's Miss April 1997, and was also featured in several of its newsstand specials. The work allowed her the opportunity to travel to many exotic locales, including Fiji, Honduras, and throughout South America.