The popstar-turned-fashionista broke down in tears as she collected the trophy for 'Designer Brand Of The Year', beating out the likes of Stella McCartney and Burberry.
"I'm so sorry for crying. This is really rubbish of me," she said upon collecting her award. "I am so nervous, this means so much to me."
The 37-year-old also took the opportunity to thank her footballer husband David for his continued support.
"Without David I wouldn't have had the courage to do what I'm doing," she gushed.
The British Fashion Council explained Beckham's win by saying: "She is her own customer and this insight has created a label with many loyal followers across the globe."
Despite losing out to Beckham in the category, McCartney went on to receive the award for 'Best Red Carpet Designer' from her friend Kate Hudson.
'Designer Of The Year' went to Sarah Burton for Alexander McQueen, who designed the dress for Kate Middleton's wedding to Prince William in April.
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