Reese Witherspoon  skirt sunglasses sandals coke  drink Reese Witherspoon  skirt sunglasses sandals coke  drink Wanna know how Reese Witherspoon keeps off those lbs.? By drinking Coke Zero!

The mom-of-two was looking like a spokesmodel for the brand yesterday, looking fit and fab even in a baggy shirt.

Last night, Reese lent her time to a telethon for Stand Up To Cancer, which aired on multiple networks to raise money for cancer research.