THE Elf on the Shelf has taken off in recent years as parents use the toys to "keep a watchful eye" over their children during the festive period.

Thanks to Instagram, a new meme challenge has been born where celebrities are superimposing images of other celebrities that rhyme with their name into their pictures.

What is Elf on the Shelf?

Elf on the Shelf is a toy that is sent by Santa to watch over little children and make sure they're behaving properly over the festive period.

The craze started after author Carol Aebersold penned the children’s book of the same name in 2005.

Parents are supposed to move the puppet around the house each day to create the illusion that he is popping up somewhere new and always reporting back to Santa.

Elf on the Shelf has its own official website, where elves can be purchased including the accompanying book.

It's not exactly easy to think of a brand new set-up for the elf every single day, but luckily there's plenty of inspiration out there.

What is the Elf on the Shelf meme?

Amongst the Elf on the Shelf holiday craze, The Real co-host Garcelle Beauvais recently shared a tiny image of herself atop Pharrell William's shoulder.

Amusingly noting that their first names rhyme, a meme was born on Instagram.

“You’ve heard of Elf on a Shelf, now get ready for this,” Beauvais, 54, shared on her page.

Several other celebrities have participated in the meme since Beauvais shared her hilarious image.

What celebrities have participated?

Elizabeth Banks shared a red carpet photo of herself with Tom Hanks as Forrest Gump imposed sitting on her shoulder.

“I know you’ve all heard of Elf on the Shelf, but have you heard of …” she wrote.

"@elizabethbanks, I raise your Hanks on Banks with a Stark on Mark!" Mark Ruffalo wrote with a little Robert Downey Jr, aka Tony Stark on him.

Reese Witherspoon also responded to Banks, writing "Oh hey @elizabethbanks! I see your Hanks-on-Banks and I raise you a Grease-on-Reese. #myelf" with a photo of Grease's Sandy and Danny dancing on her shoulder.

"You've heard of the Elf on the Shelf but how about…. #LukeBryanOnARyan" Ryan Seacrest posted with Luke Bryan posed on him.

Actress Kerry Washington also participated.

"Because @elizabethbanks @reesewitherspoon & @markruffalo always inspire. I present to you... Perry-on-Kerry" she wrote with a small Katy Perry posing on her shoulder.

Queen of Christmas tunes Mariah Carey shared a picture of Jim Carrey as the Grinch tiptoeing on her shoulder, writing: "Throwing some tinsel on this challenge and presenting you #CarreyOnCarey 😄"

Does Elf on the Shelf have to quarantine this year?

This year because of the coronavirus pandemic travel measures, many Elf on the Shelf owners are curious if their elf has to quarantine. 

According to the Elf on the Shelf website, all elves are “100% healthy and remain well at the North Pole."

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Yet, if families wish for the elf to quarantine or wear a mask to abide by proper protocol, that is completely acceptable too. 

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And for the most cautious families there is always an isolation house option.

The elf does not have to remain away from the family for the quarantine period of 14 days, just a few hours can be enough.

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