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Over the weekend, both stars shared sweet photos of themselves with their son X AE A-Xii, who was born in May.
"Tell me of the waters of your homeworld," Grimes (born Claire Boucher) captioned her photo, which showed the mom of one, 32, holding her son, who is nicknamed "X."
Meanwhile, Musk shared an adorable dad moment with his son on Twitter, posting a photo of the 9-month-old sitting on his father's lap and pulling on his collar while the Tesla founder, 49, appears to be on a phone call.
"The Second Last Kingdom," Musk captioned the photo, a reference to the Viking-inspired haircut Grimes gave their son last month.
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The "Delete Forever" singer gave X a haircut "inspired" by one of her favorite TV shows, The Last Kingdom — a historical drama about the Great Heathen Army's arrival in Britain during 866 A.D.
"Not sure this haircut went well but he's Viking now ⚔️," she captioned an image of her son rocking a new look while playing with toys in the bathtub last month.
In another photo, Grimes could be seen trimming her baby boy's hair with a pair of scissors.
"Haircut inspired by the last kingdom on Netflix which is a masterpiece," she continued alongside another photo of her son's new haircut.
Grimes welcomed her first child with boyfriend Musk on May 4, 2020.
"Grimes has a much bigger role than me right now," he said of the singer, whom he also called "pretty special" and "one of the most unusual people I've ever met."