If I responded to the thread title "hottest..." there would be an element of service/intensity in the answer, not just looks. Would be thinking Tara of TT, Lucia of GGR, Rebecca of AL, at least a couple at NYAW.
However OP then asks for best looking. With the qualification that I like girls who are GND pretty and have tight bodies, not runway models with big racks, I like
Rebecca (AL)
Rachel (GGR) (who does have a big enhanced rack and not the tightest body, btw, but I get over it because she is so fucking pretty)
Sara (AS)
A recent loss who IMO would have run away with this poll was Mimi of NYAW, previously GFEAS and very briefly A&K. Wow. Just wow. Unfortunately she went home for good