The 20-year-old was accompanied by several male friends during the session. She wore a cropped white top, white shorts and a pair of gold sneakers, reported Aceshowbiz.
The 31-year-old tattoo artist and TV personality wrote, "Tattoo time," on Instagram on Sunday. Cyrus retweeted the post, but she did not give any detail of the new collection.
Kat previously has made two tattoos for the singer. The artist inked two crossed arrows on her right elbow in January 2013. "Loved tattooing Miley Cyrus yesterday! Simple symbols of friendship make beautiful tattoos," she tweeted back then.