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They got in the Christmas spirit by singing All I Want For Christmas Is You on Wednesday.
And Mariah Carey's twins Monroe and Moroccan continued to celebrate the upcoming holiday on Friday.
Mariah - Snaps - Instagram - Kids - Letters
Mariah, 48, posted several sweet snaps to Instagram depicting her two kids writing letters to Santa Claus.
'Writing our letters to Santa! It's a big moment,' wrote the multiple Grammy winner in the caption, before adding a Santa emoji.
Snap - Monroe - Moroccan - Grin - Camera
In the first snap, Monroe and Moroccan, both aged seven, grin at the camera while both holding pencils over their 'Dear Santa' pieces of note paper.
Moroccan wears a stylized zip up sweater, while Monroe rocks an adorable pair of orange-frame glasses.
Photo - Moroccan - Close-up - Monroe - List
The second photo is a single of Moroccan, and the third is a close-up of Monroe's list.
Her list was quite short, including only seven...
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