She’s a model citizen.

Cindy Crawford helped raise funds at Cantor Fitzgerald’s annual Sept. 11 Charity Day, working the phones and taking orders for trades, with proceeds going to the firm’s disaster-relief foundation and other causes.

“I said ‘a billion’ more than once,” she was heard telling employees. “And ‘a billion pesos’ once.”

The supermodel was also heard saying on the phone, “It’s fun. I am trying to learn [how to trade], but it’s very over my head right now.”

Crawford, Dr. Ruth Westheimer, Tony Blair, Walt Frazier, Billy Crudup, Coco Rocha and other VIPs helped raise money for their chosen charities. Prince Harry and Kit Harington participated in the London companion event.

On 9/11, 658 Cantor Fitzgerald staffers were killed.