The troubled fashion designer - who created the oyster silk wedding dress worn for her nuptials to rocker Jamie Hince last week - was "never" going to let her down, despite his personal problems, including his recent sacking at French fashion house Dior for proclaiming he "loved" Adolf Hitler.
A source said: "Kate is his biggest muse and he was never, ever, going to let his friend down. He did Kate's 21st birthday dress, her 30th birthday dress and Galliano's show was the first she ever walked for. So this wedding day ties up a lot of things beautifully."
British designer Alice Temperley recently revealed she thought the 37-year-old model would set a trend with her dress, whatever she chose to wear.
She said: "I am certain she will look absolutely stunning, unique, beautiful with a bit of a rock 'n' roll twist. I would love to see her in something vintage looking, romantic and slightly bohemian.
"However, whatever she chooses, she will look fantastic and I am sure women will want to wear something similar to their weddings for years to come."