PepsiCo has engaged Lindsay Lohan to bring a naughty twist to a holiday tradition, encouraging consumers to mix Pepsi with milk and serve “Pilk & Cookies” for Santa.

The mix of milk and Pepsi—known as a “dirty soda”—is another example of brands seizing on a viral food and beverage trend on Tiktok. “Dirty soda” trended earlier this year on the video-sharing app, with users demonstrating combinations of soft drinks mixed with creamers, flavored syrups and fruits, showing Gen Z’s appetite for food “hacks” and customized products.

“Combining Pepsi and milk has long been a secret hack among Pepsi fans,” Todd Kaplan, Pepsi’s chief marketing officer, said in a statement. “Now with the rise of the ‘dirty soda’ trend on TikTok and throughout the country, we thought Pilk and Cookies would be a great way to unapologetically celebrate the holidays with a new and delicious way to enjoy Pepsi this season.”

In new ads running on YouTube, Lohan, dressed in pajamas, sneaks down the stairs as Santa vanishes after preparing a glass of “Pilk.” Tasting it, Lohan remarks, “That’s one dirty soda, Santa.” 

In another video, Lohan dons a Santa outfit and mixes the combination, pouring a Pepsi (“nice”) then milk (“naughty.”). Lohan stars in the new Netflix film “Falling for Christmas” and recently released a rendition of “Jingle Bell Rock,” associated with the film.

Read more: The 10 best celebrity ads of 2022

The ads were prepared by Creators League Studio, which is PepsiCo’s in-house content agency.

Straight outta Utah

Pepsi and milk has had a place in popular culture for years. It was a favorite of Laverne DeFazio of “Laverne & Shirley” and reportedly of Laverne actress Penny Marshall. The recent “dirty soda” trend has origins in Utah, where drive-through chains such as Swig and Sodalicious that specialize in such combinations were founded. Those chains benefited when the Mormon church in 2012 okayed caffeine in cold drinks and have now expanded regionally, becoming Mountain West competitors to chains like Sonic, which is also known for customizable drinks.

The trend’s crossover to viral social media was linked to an Instagram post picturing singer Olivia Rodrigo with a Swig cup.

Last month, the Larry H. Miller Company, owner of the Utah Jazz NBA team, acquired a majority stake in Swig, which bills itself as “Home of the Original Dirty Soda.” Miller said the company—currently with 46 locations in Utah, Arizona, Idaho, Oklahoma and Texas—has plans to open another 25 shops in 2023. 

Pepsi's plans

Pepsi is promoting its “Pilk” with sweepstakes for fans who post their own photos of “Pilk and Cookies” on Twitter, Instagram or Tiktok, tag the @Pepsi account and include the hashtags #PilkandCookies and #Sweepstakes. Twenty-five winners will receive gift cards of $1,000.

A press release from Pepsi listed recipes for additional dirty sodas along with suggested cookie pairings, including “The Naughty & Ice” (1 cup of whole milk, 1 tablespoon of heavy cream, 1 tablespoon of vanilla creamer, and 1 cup of Pepsi, with a chocolate chip cookie; the “Chocolate Extreme,” (blend 1/3 cup of chocolate milk and 2 tablespoons of chocolate creamer and transfer the mixture to 1 cup of Pepsi Nitro with a double chocolate cookie); “The Cherry on Top” (½ cup of 2% milk, 2 tablespoons of heavy cream and 2 tablespoons of caramel creamer, together with Pepsi Wild Cherry and a gingerbread cookie); the ”Snow Float” (½ cup of oat milk, 4 tablespoons of caramel creamer, poured into 1 cup of Pepsi Zero Sugar with an oatmeal cookie); and the Nutty Cracker (½ cup of almond milk and 4 tablespoons of coconut creamer atop Nitro Pepsi Vanilla, paired with a peanut butter cookie).