For the car, judging by the way it looks from the back, I believe it's an Audi R8 convertible, but the one in the strip is missing the air vents behind the headrests.
EDIT: I missed Eisu's response. Nice to know I got it right.
Well, I at least recognized it as an Audi immediately, so you were not too off, Eisu. ;)
Gosh, Nadine is spoiled to the eleven...
Sithlord of the Sithling and best customer of McLovecraft's , in the business of keeping the little Platypus in business Moderations in GREEN and signed by the DAMNed. I am not anonymous! Also, MODSMACK!! Winner of the... 2010 Kilopost FRANKIE; 2010 Mad March Nom Off; 2010 Joker Cleavage Contest; 2010 Fan-Thing Contest; 2010 Mimic Contest (tied); 2011 Joker Cleavage Contest; 2011 Contest-for-the-next-Contest (tied)
I doubt Eloise is possessive about Domenico, unless she's deluding herself that she can turn him into a one-woman man with the power of True Love. In fact he seems like a perfect example of the cynical casting-couch lays Nadine was talking about, assuming Eloise could bag him.
If Eloise's crush is a preexisting character I'd go with Pierre or Alex, with Gary at the outer edge of possibility. I'm betting on Pierre, though, mostly because Nadine seems to know exactly where she can find him during the day and it seems to be easily accessible, unlike a school or Montreal. I wouldn't call it too big a coincidence either, since Pierre has a shop in a ritzy neighborhood popular with fashion figures that Eloise could plausibly hang around.