I believe that is Jill Wagner from Mtv's Punk'd... she was on either season 2 or 3... here is her Stuff Magazine lay out... if it isn't her it certainly looks like her... hope this helps

http://www.stuffmagazine.com/cover_girls/girl.aspx?id=354

> This girl is absolutely stunning. For the first time in my life I can honestly say the commercial (girl) makes me want to go out and buy a Mercury!!!! Does anybody know anything about this girl, name, other work she has done, agency? I can definitely see her developing a huge following (not to mention career) from this ad.
>
> Thanks.