What does Hugh Hefner find attractive about new girlfriend Dasha Astafieva?

It's easy to see. Literally!

The Ukrainian model posed on the red carpet prior to Playboy's 55th anniversary party last week, and she did so in an outfit that Jenna Jameson might be too shy to wear.

And in case the see-through dress wasn't revealing enough, Dasha ditched her thong, giving photographers a glimpse of what Hef goes home to every night...

Click on the pictures below to see more - A LOT more - of Dasha Astafieva...