The milkshake drink features creamy vanilla ice cream mixed with intense dark chocolate shards to bring back all the nostalgic Christmas vibes.
You can get your hands on a Viennetta Krushem for just £1.99 and they are available now. Yes, now.
However, they're not going to be around forever and sales will end on 3 January.
You can also upgrade your meal to include the Krushem for only 99p.
KFC has promised that the festive treat will be available for takeaway, drive-thru and mobile ordering via the KFC app.
Of course, if you missed last week's announcement, you're probably thinking, 'Woah, back up. What was that about a Gravy Burger?'
Well, you read that correctly.
The gravy lover's dream meal contains a brand-new burger with a layer of gravynnaise (a delicious gravy and mayonnaise concoction), an Original Recipe chicken fillet, a slice of melted cheese and a 'hash brown gravy boat', all stacked inside a sesame seed bun.
Announcing the new meal, KFC said: "We see you. Yeah you. The one who queues eagerly to get a taste of KFC's gravy. The one ordering that extra pot to liberally dunk, dip or drizzle.
"The gravy addict who stocks up the fridge way ahead of Christmas Day. Every year you go to great lengths to get your KFC gravy fix, so this Christmas we've got a tree-mendous (sorry!) treat for you."
If you're wondering what the hash brown gravy boat is all about - well, it's the normal potato goodness with a dip in the middle to hold on to the gravy so you don't need to worry as much about leakage. Phew.
KFC explained: "An unsurpassed triumph of hash brown virtuosity, it features a special well that's expertly designed to hold gravy. And plenty of it.
"With structurally certified walls to hold even the most generous helping, we've also gone ahead and developed an all-new mini gravy pouring pot, so you can really let it flow."
Alongside the burger, the £6.99 Gravy Burger Box Meal comes with a pot of gravy (obviously), plus an Original Recipe Mini Fillet, a side, a pot of Gravynnaise and a drink.
The Gravy Burger Box Meal Box is available across all KFC outlets in the UK and Ireland from 16 November and can also be ordered via Deliveroo - as it's a seasonal item, you won't have long to get your hands on one.
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