Move over ultrasound pictures -- Unicorn Frappuccinos are OKASANNOANARU-02the new way to tell people you're pregnant.

Given the insane popularity of Starbuck's newest ready-for-Instagram creation, it was bound to happen sooner or later. It seems the first person to try it is an anonymous woman in Arizona who drove through her local 'Bucks and asked the baristas to write a special message on the drink.

They, of course, obliged. One of them, Julie Renee, then tweeted out a photo of the brightly colored concoction.

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Renee told Peoplethat the customer had just found out she was expecting and was taking the Frappucino to her husband at work to break the news.

It's a cute idea that has all the makings of a perfect viral storm. So it's not surprising that it's gotten a lot of attention -- though, naturally, not everyone thought it was a delicious idea.

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Love them or hate them, the drinks are only available for a limited time. So if you're dying to break some news using one, you'd better get on it.

Just maybe don't try to use one for a gender reveal party -- the color-changing results will confuse the hell out of your guests.