“It’s better than I thought it would ever be,” Iman told our friends over @PEOPLE about joining the cast of the TV series, The Fashion Show: Ultimate Collection at WWD‘s milestone 100th Anniversary Party at Cipriani 42nd Street in New York on Tuesday night. The Somalian-born model explained, “It’s really actually about a fashion show. Not individual designers.” But Iman has already singled out one designer as a personal favorite, modeling a custom silk taffeta Victoria Beckham dress to the bash. “I love it,” the 55-year-old said to PEOPLE of the one-of-a-kind frock that Victoria whipped up for her friend. “I think she’s one of the best designers.” The ageless supermodel continued her Posh praise, enthusing “She’s no longer an emerging designer, she’s become a real designer.” One fashion icon who doesn’t have any input regarding Iman’s sartorial choices is her husband of 18 years, David Bowie. The 63-year-old British rocker hasn’t given or received fashion advice from his confident wife. “No neither, he’s very fashionable and so am I.”