The CPAA is completing 50 years on Sunday and to support it a fashion show is being organised.
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The 33-year-old actress said the battle against cancer must be won.
"Battling Cancer is a most worthy fight and one which can and must be won. My every good wish for them as they complete 50 years of exceptional service to the cause," she added.
Talking about walking for the designer duo, Sonam said: "I am delighted to walk for Abu and Sandeep. They are (my) favourites. Its always a pleasure to work with them and wear their fabulous clothes."