Halsey and her friend Sean got matching Venus and Mars tattoos on their elbows in July 2015. When asked about the meaning of her planet tattoo Halsey replied:
“My friend Sean is an Aries so his ruling planet is Mars and mine is Venus and his birthday falls EXACTLY on my half birthday so we got each other’s ruling planets!”
Musician Blackbear also has a similar black and red planet tattoo as part of his left arm sleeve. Halsey shared a picture of their two tattoos together, but it seems that the matching is just a coincidence since he had his tattoo before she got hers.