The actress has already donated 100,000 dollars for the relief of flood victims. "These are not just humanitarian crises. This is an economic and a social catastrophe," the Daily Times quoted her as saying.
The floods have left one-fifth of Pakistan under water and have affected an estimated 17 million people.
UNHCR has revised its section of wider appeal from 41 million dollars to 120 million dollars, as the needs of the flood victims continue to outpace the ability of aid groups to respond.