The 47-year-old, who walked the ramp on Wednesday, first appeared in one of the Tunisian-born couturier's shows over three decades ago when she was just 16, reports dailymail.co.uk.
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"I kept it all quiet and it was a big surprise. It was overwhelming and I have to admit I was nervous," Campbell said.
"It was very emotional walking out as I didn't want to let him down and wanted him to be proud of me. His clothes are exquisite. He is truly the master," she added.