The 20-year-old singer -added to her ever-increasing collection of body art with the help of the former "LA Ink" star, who understands firsthand the stress of a public breakup.
(Remember Kat's messy split from Jesse James?!)
"Just did the RADDEST tattoo on @MileyCyrus -a miniature rendition of a daVinci anatomical heart!"
VIEW THE PHOTOS: Guess The Celebrity Ink!
Kat also shared a photo collage featuring Leonardo da Vinci's famed sketch of the human heart (the inspiration for Miley's new ink), the resulting tattoo on Miley's arm - still pink from the tattoo - and a closeup of the design.
The new tattoo joins Miley's various other body art, including a heart on her little finger, an anchor on her wrist, a dreamcatcher on her ribcage, the words "Just Breathe" on the left side of her chest (in honor of a friend who died of cystic fibrosis), an equal sign on her ring finger (in support of marriage equality), the roman numerals VIIXCI on her right forearm, and
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