The socialite and her partner were driving away from a Los Angeles restaurant when Waits allegedly clipped the female snapper, before speeding off.
Paramedics were called to the scene to treat photographer Carol Williams, while Waits reportedly returned to the scene later without Hilton and was cited for a hit-and-run by cops.
But now Williams has spoken out about the clash - insisting she shouldn't have been "out in the middle of the street" in the first place, adding, "I admit I am at fault as much as him".
She also defended Waits' decision to speed off following the scrape, telling TMZ.com: "After he rolled over my foot, he rolled the window down and asked if I was fine... someone else answered for me and said 'yes' and he drove off... I want to take responsibility for my actions.”