So, in Jay Z's "Big Pimpin'" video, who is the girl dancing by the Mercedes with the white cowboy hat on? (that's in the later, third section of the music video)
Most probable answer: it's Gloria Velez.

Actually, there are so many people in this video that it's hard to track and probably only she can tell for sure.
Here in the Forums, it was pointed out that she was also in
- "Holla Holla" video by Ja Rule, and in the
- "Thong Song Remix" video by Sisqo the girl in the blue dress. She also had editorial recognition in "The Source" magazine.