The girl on the left in the second picture is wearing the Ray Ban Cats 1000 but I don't think Jessica's are Ray Bans. I don't know for sure what they are but my best guess is the Dita Fever.
I'm pretty sure they are Linda Farrow the Row Sunglasses as the arm to them is quite distinctive. Jessica wore orange sunglasses recently with a similar arm which were the Row. sorry I can't give you a style number though