A North East McDonald's worker has reacted to a new milkshake that the fast food restaurant will be serving, with customers having just seven days to buy it. 

Posting on TikTok under the name claire_armstrong1064, the worker has videoed herself making the new drink, a Grimace Shake, and telling audiences what she thinks about the new beverage.

The Grimace Shake, which is already popular stateside, went viral when it was introduced to US restaurants last year.

@claire_armstrong #mcdonalds #mcdonaldsuk #mcdonaldsworker #grimiceshake #grimice #milkshake #trywithme #fyp #viral #mcdonaldssecrets #mcdonaldshacks #mcdonalds #mcdonaldsdrivethru #mcdonaldsdrivethru #mcdonaldsshake #purple #yum ♬ original sound - claire_armstrong1064

The purple drink blends together a blueberry-flavoured syrup with the brand's iconic milkshake base.

The cool beverage is inspired by the chain's monster-like Grimace mascot which was introduced in the 1970s.

He was originally a villain who stole milkshakes from customers but was later rebranded into something more child-friendly.

In the TikTok video, viewers can see the staff member pouring the milkshake from the machine before she tries it and reacts with a: "Yes to the Grimace milkshake".

McDonald'sMcDonald's (Image: PA MEDIA)

She goes on to say: "I rate that. If you don't like blueberries, you probably won't be a fan."

The McDonald's worker then advises anyone who wants to try it to visit their nearest fast food branch as soon as possible, given that people can only have it for one week, with Claire saying that each branch of McDonald's is given an "allotted amount" and "once it's gone, it's gone."

The Grimace Shake will be available in most UK McDonald's restaurants starting Wednesday, August 28.

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Those looking to try The Grimace Shake will need to act quickly as it will only be available for one week, meaning customers will have to snag one before September 4.

The milkshake will set Brits back around £2.69 for a medium size, while a large version of the shake will be priced at around £2.99.

It should be noted that prices may vary depending on the location the product is being sold.