用 showgirl 沒問題喔 !!

Wikipedia - http://en.wikipedia.org/wiki/Showgirl

"Showgirl" is often used as a term for a promotional model in trade fairs and car shows, etc. These young women often have no dance or entertainment skills but are there to attract attention to their sponsors' products with their beauty.

promotional model 可能更貼切, 但是 太繞口了 ~