Stepping out for her third day of fashionable festivities in the City of Lights, Cameron Diaz closed out her Wednesday (January 25) with a nighttime Paris Fashion Week runway show.

The "Knight & Day" darling dazzled in a white lacy cutout frock as she took to the Hotel Salomon de Rothschild for the Valentino Spring/Summer 2012 Haute-Couture catwalk display.

Earlier in the week, Miss Diaz took in the Armani Prive PFW showcase, at which she was asked whether anything caught her eye in terms of a possible Oscars red carpet dress.

To this, the 39-year-old replied, "You know, on paper, a dress with scales doesn’t sound so good. But Mr Armani made it work. It was chic but also amazingly avant garde. Nothing is obvious but it makes a major statement: that’s the beauty of couture."

Enjoy the pictures of Cameron Diaz at the Valentino Spring/Summer 2012 Haute-Couture show in Paris (January 25).