The actress, who grew up on Long Island, stars in the commercial which was posted on YouTube by Pepsi on Thursday, Dec. 1.
In the commercial, Santa is shown pouring a can of Pepsi into the milk that was set out for him. Lohan then comes down the stairs after he leaves and gives the beverage a try.
"That is one dirty soda, Santa," she says.
The drink, which Pepsi is calling "Pilk," has left some viewers divided about whether they'd give it a try.
Some social media users described the drink as "nasty" while others defended it, comparing it to an ice cream float.
Lohan also stars in a newly-released Netflix film called "Falling for Christmas."
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