By Monica Smith-Acuna

Milkshakes have gotten an R rated makeover. which means you’re definitely gonna need an ID to partake. So, say goodbye to this innocent diner staple and hello to this adult-only treat.

I'm talking about decadent milkshakes mixed with alcohol, which is pretty much the best mash-up since the spork came about (I'm pretty good with analogies). This newfangled drink is where a classic dessert and a cocktail meet and make sweet (literally) sweet love. Here's three area places, where you can get in on this action.

If you need some confidence impressing a date at Ted’s Bulletin, drink your liquid courage in milkshake form. And let’s face it: everyone looks cooler drinking a frothy milkshake (try the Dirty Girl Scout), than sipping on a lame scotch. Amiright, Don Draper?

Everyone knows the best way to cure a hangover is to just get drunk again. Right? The Hamilton thinks so, or at least it seems to think so since booze-laden shakes are only served at brunch. Try the cherry amaretto of the Grand Marnier Creamsicle shakes to trade your hangover headache for an ice cream headache.

The adult milkshakes at The Diner are IN-DUL-GENT (and, yes, the dramatic three syllables and capital letters are necessary). The Georgia Peach is one of the best in town. Composed of house-infused orange cinnamon bourbon, vanilla ice cream and—wait for it—peach pie, this is the nectar of the gods, or at least of the Daniel Day-Lewis. Surely, he'd drink that up.