Eye-popping Christmas craze! Women are taking the holiday sweater trend to an extreme by decorating their exposed breasts to look like REINDEER (Details, pics)

Ugly Christmas sweaters might be considered one of the tackiest trends of the holiday season, but this twist on the classic is sure to take the crown.

As the Christmas season ramps up, thousands of people are readying their best 'ugly' sweaters to sport out to parties - and that includes ones with strategic cut-outs. A number of very crafty Instagram users have been hopping on the 'reindeer boob' holiday trend, dressing up their exposed breasts to look like Rudolph.

Some of the costumes feature a perfect breast-sized hole snipped out of the front of the sweater, while others just pull down a stretchy top on one side to leave the breast exposed.

Tinsel is used around the edge of the cut-outs to give the appearance of a curious deer poking its head out. Googly eyes, felt antlers and a big, sparkly red pom-pom ball are used to complete the look.

Ladies participating in the trend have been posting the results proudly to Instagram, tagging it with the hashtag #rudolphboob.Pre-made versions are sold on Etsy by Salt Lake-based retailer YourSassyGrandma, including a red sweater with a green tinsel-surrounded cut-out.

'If you want to stand out at your Ugly Sweater Party, then this SEXY reindeer ugly Christmas sweater is for you!' reads the item description.

Each one of the costumes comes with an up-cycled sweater with eyes and nose prepared with a one-time wear adhesive. Unfortunately for fans of the design, the sweaters have already completely sold out - though there are men's versions on offer still for $50 a pop.

Indeed, ladies aren't the only ones having a go at the trend, with a number of men simply cutting out a hole in a sweater and sticking a pair of felt antlers and googly eyes to make their own reindeer, leaving the exposed nipple in place of a nose.