PHOTO: Susan Sarandon's 'Got Milk?' Ad

PHOTO: Susan Sarandon's 'Got Milk?' Ad
Susan Sarandon

01/18/2011 AT 06:45 PM EST

What's the secret ingredient to Susan Sarandon's youthful looks and vigor?

"I drink light milk as often as I can," Sarandon, 64, tells PEOPLE. "I have it in other ways like drinking it in coffee and I love ice cream. I highly recommend light milk."

The Oscar winner, the latest celebrity spokesperson to don a milk mustache for the "Got Milk?" ad campaign, is also a UNICEF Goodwill Ambassador and says it was a "no brainer" joining the milk campaign.

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