She thanked her eldest son upon receiving the honour.
The former Spice Girl, whose womenswear designs are regarded for their wearability, acknowledged her career change from being a popstar to a full time designer.
She also said she wanted women to support each other more.
The mum of four spoke about the amazing 10 years she's had, and being blessed to have two careers and in those years attributing it to "Girl power!"
Other winners at the event were:
Solo Artist Of The Year - Rita Ora
Man Of The Year - Daniel Radcliffe
Film Actress Of The Year - Rebel Wilson
Breakthrough Of The Year - Samantha Barks
International TV Actress - Zosia Mamet
Writer Of The Year - Miranda Hart