She lost her virginity while a junior in high school and her first Girl/girl experience was when she was 20. Leone was member of the San Francisco Sheriff's Department working as an institutional police officer at San Francisco General Hospital. She is engaged to former San Francisco Police Department officer Darryl Watts.

On May 21, 2004 Kelly Francisco and Darryl Watts (both active SF Police Officers) were discovered to be the protagonists of "Bus Stop Whores" a 45 minutes hardcore video (whose teaser is These girls won't ride a bus today!) filmed in Los Angeles, California, it is a series known as "Bus Stop Whores" available on a pay to view porn website showing various sex scenes, each with a different storyline. In the one with the two SF Cops: the female Kelly Francisco plays a hooker called "Myra", in one scene she solicits a sex act for US$500, and the male Darryl Watts plays a john on the prowl.

Her first on-camera boy/girl scene was with Kurt Lockwood in 2003. Leone also performed her first on-camera "anal scene" with Kurt Lockwood, in late December 2003. Tom Byron filmed it for the all-anal "Meat Pushin' in the Seat Cushion 2", released in early May 2004 by Evolution Erotica.

Leone's first DP scene was shot in 2004 with Joe Friday and Van Damage, it appeared on Volume 9 of the "Double Parked" series produced by DVSX. Leone considers her boobs as her best asset. She got breasts implants in 2002, moving from a small C-cup to DD-cup.