Two things.
Firstly, here she is front row of Zac Posen with Steven Klein, of course. It's really strange they didn't name her or shoot her alongside him although I like how she's bent her neck into the shot.

style.com
Additionally, I read this in page six earlier in the month. I would kill to see a photograph of her outfit on this day.
September 2, 2008 --
THE competition was stiff at the Hampton Classic, with high-priced horses flying over fences on the field - but the clear belle of the ball under the tent in Bridgehampton Sunday was Daphne Guinness.
Outshining the likes of Naomi Campbell, Ivana Trump, Kelly Ripa and Kelly Klein, the brewery heiress wore cheek-exposing short shorts with a black bondage bustier and hooker heels. Heads in the Labor Day weekend crowd swiveled as the ex-wife of Greek shipping heir Spyros Niarchos strutted through the horsy crowd and joined the table of Sale Johnson and hubby Ahmad Rashad.
Guinness, the mother of three, especially drew stares when she leaned over the rail to get a better look at the show jumpers, exposing her derriere.