Picture from PEOPLE. Hayden Panettiere, Got Milk?

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The actress, who celebrated her 18th birthday on Tuesday with a party on the beach, is the latest mustachioed face of those “Got Milk?” ads.

“You don’t have to be a hero to feel invincible. That’s why I drink milk,” she says in the ads, part of a campaign to get teens to drink three glasses of low-fat or fat-free milk a day.

The ads, debuting Sept. 10, were shot in May by famed photographer Annie Leibovitz and show Panettiere in a sleek red dress holding an exploding glass of milk.

On Monday, the actress joked to David Letterman on his Late Show about her milestone birthday: “I don’t think much changes when you’re 18 – maybe the way people treat you. But I think the only things I can do is buy cigarettes, porn and, if I get in trouble with the law, I’m kind of screwed.”

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Hayden Panettiere looks super hot in this ad. Makes me want to run out to the nearest store and get myself a big fat bottle of creamy milk. I’d wonder how Hayden Panettiere would look like in another 10 years. Youth is kind to her pint sized body but do you think she’ll look half-decent as she is now?