These were snapped in NYC @ Somaly Mam Benefit, whose main goal is to raise awareness of the sex slave trade.
Since we already know everything about Petra, here’s a little about Veronica:
Veronika Vařeková (born June 19, 1977) is a Czech supermodel. Her name in the English-language press is often given as Veronica Varekova.
In May 2006 Vařeková claimed that Maxim magazine unlawfully used a photograph of her scantily clad — in stockings, high heels and naked from the waist up — on the cover of its June issue. The photo was taken for a British GQ magazine feature on Victoria’s Secret last year. Afterward, the photo agency Corbis sold the photos to Maxim. Vařeková says she was never told of the sale, nor was she asked for her permission to do so. [Wiki]