There's now a Christmas version of Baby Shark and it will be stuck in your head forever
Better brace yourselves.
Baby Shark is the catchy YouTube phenomenon that is showing no signs of slowing down.
It was created by a YouTube channel called Pinkfong - a South Korean channel for kids, which makes videos of sing-along songs and dances.
The video was originally released back in November 2015 but only started to spread globally this summer.
It has spawned a series of cuddly, singing toys (which seem to be the must-have gift this Christmas) and even featured on this year's Late Late Toy Show.
Now, a brand new version of the viral song Baby Shark has surfaced online - and just in time for the holiday season.
The Christmassy track, called Santa Shark, is already proving to be a huge hit
The festive take on the super-catchy song introduces a number of new characters, including Santa Shark, Reindeer Shark, and Elf Shark.
The new lyrics see the characters make the toys, wrap them up and loading up the sleigh - all followed by 'do, do, do, do, do, do, do' - before swimming off to deliver the Christmas gifts.
More than four million people have watched the video since Super Simple Songs shared it on YouTube in late November.