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Playboy covergirl Aubrey O’Day took her beloved puppy–a frequent red carpet companion–out to the Christian Siriano show. Later in the evening, you know someone spotted them drunk on champagne and totally making out, hardcore.

In stark contrast, Eva Mendes and Kate Beckinsale were twinsies in sleek, black outfits and matching dark brown tresses at the Calvin Klein show.

Looking like an old pro, Blake Lively cut a stunning figure in her grey turtleneck jersey dress and leather jacket. Being fashionable looks exhausting, but like it burns lots of calories. No wonder everyone’s so damn thin.

Featured in the gallery: Kate Beckinsale, Anna Wintour, Eva Mendes, Ray J, Tori Spelling, Aubrey O’Day, Nina Garcia, Mark Indelicato, Katrina Bowden, Morley Safer, Blake Lively, Laura Dern, Amanda Hearst, David Lauren, Lauren Bush.

Click on the “continue reading” link for a full list of which celebrity attended which show.

Gallery Info: Celebrities at 2009 New York Fashion Week February 19 & 20, 2009.

Calvin Klein: Kate Beckinsale, Anna Wintour, Eva MendesTadashi Shoji: Ray JChristian Siriano: Tori Spelling, Aubrey O’Day, Nina Garcia, Mark Indelicato, Katrina BowdenRalph Lauren: Anna Wintour, Morley Safer, Blake Lively, Laura Dern, Amanda Hearst, David Lauren, Lauren Bush