The 5-foot-11 beauty is a longtime fan of the label, which was co-founded by designers Georgina Chapman and Keren Craig. Earlier this year, she landed on best-dressed lists when she wore a gold lamé Marchesa gown to the 2012 Oscars where her beau, Clooney, was nominated for Best Actor in a leading role for his film "The Descendants."
At the Marchesa show, Keibler was seated in the highly coveted first row, right next to celebrity style mavens Kim Kardashian, Kanye West and Tyra Banks, reported the Wall Street Journal. And the red carpet treatment didn't end there; after the show she stopped to pose for photographs with Chapman and Craig, along with Kardashian.
The star-studded event was also attended by fashion regulars like Anna Wintour, Olivia Palermo, Bar Refaeli, and designers Rachel Zoe and Rachel Roy.
Keibler's boyfriend Clooney, 51, shot down claims from a British tabloid on Wednesday that the couple had ended their relationship. "A story published by a London tabloid, The Sun, concerning George Clooney and Stacy Keibler is not true. Total fabrication designed to sell newspapers," said Clooney's PR rep, Stan Rosenfield, in an interview with E! News.
The Sun story alleged that Keibler had complained to a friend that Clooney was commitment-phobic and wanted to be single.
"[Stacy] said George wants to be on his own again and has no intention of getting married," said the source. "Stacy hoped they would be together long-term. It was a big breakthrough to spend time with his parents. But over the last few weeks George has pulled away from her."
Yet contrary to the rumors, Keibler has appeared in cheerful spirits as she makes the New York Fashion Week rounds. On Tuesday, she was spotted at the Vera Wang show, where she had the honor of being called "chic" by Wang.