In case you needed more reasons to be baffled by the modeling industry’s definition of “straight-size” and “plus-size,” Paulina Porizkova provided it during yesterday during the Glamour Women of the Year conference at 92Y. “Excuse me, I have to do this,” she said, interrupting her fellow panelist Crystal Renn mid-sentence. “Crystal, can the two of us stand up next to each other for a moment, so that the audience can see us?” Renn obliged, and the two women stood shoulder-to-shoulder. “I'm pretty much the same size now that I was in the eighties, when I was actually modeling, and I was known for doing bathing suits,” explained Porizkova, who if anything looked larger than Renn once they stood side by side. “Here's Crystal, a plus-size model,” she said, gesturing toward Renn. “This is a plus-size model in 2010. This [she pointed to herself] is an average-size model in 1980. Times have changed.” Unsurprisingly, Renn had plenty to add to this: What I ...