Ja, Paris is certainly not an ugly woman but she lacks that certain little spark that some ladies (with less money and less fame) have.
As for the ad, it is crap because all I took away from it is that a Bentley is a hell of a nice car. Not enough frames were dedicated to the burger and Paris doesn't really have the arse for bending over in front of a camera: it's far too bony. Perhaps she could eat at least two of those burgers every meal time and come back to reshoot that part later. However, I wouldn't call the police if I got back from work and found her in my room making herself some coffee. :-P