A CBS Detroit article said the blended crème drink will be made with sweet pink powder, mango syrup and a sour blue drizzle, topped whipped cream and pink and blue powder.
The drink will be available only at participating Starbucks in the U.S., Canada and Mexico.
The Unicorn Frappuccino is clearly aimed at the social-media set.
NEW YORK (AP) Starbucks is calling a limited-time beverage that changes colors and flavors with a stir of the straw a "Unicorn Frappuccino". "The more swirling, the more the beverage magically transforms!"
'Starbucks is releasing a new Unicorn Frappuccino and my life is now complete, ' wrote one, adding a unicorn emoji.
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The magical-looking drink changes color and flavor as it's swirled. The talk started last Wednesday, according to Food & Wine, when a Reddit user uploaded a (now deleted) photo of blue dust to the site, captioned as "Unicorn frapp topping".
'Omg, THE UNICORN FRAPPUCCINO from Starbucks, ' added one more.
Recently, the coffee chain officially added the viral "Pink Drink" - a popular item from its "secret menu" - to its official beverage line-up.
A few employees, friends, and social media influencers have gotten their hands on the drink, and the general consensus is that if you're into really sweet and really sour things (read: if you're under the age of 12), you'll probably love it.