Tattoo artist Freddy Negrete shared an Instagram photo of himself posing with the couple inside the tattoo ship with Swift smiling next to Styles.
"Harry and Taylor seem to be very close friends. Taylor was enjoying her first experience in a tattoo shop while Harry got some new ink," Negrete tells Us Weekly. "They're great people, having a good time. Tattoos are always fun."
Tuesday wasn't exactly Swift's first time watching a love interest get inked. The singer acted out the same scenario in edgy new video, "I Knew You Were Trouble," with actor Reeve Carney playing her boyfriend. And, coincidentally, Carney sports a similar tattoo in the video to the one Styles selected.
After Swift supported the One Direction star getting his new ink, the twosome of one month were photographed leaving Swift's home together in L.A. the following day. Joined by her mother Andrea, Swift dressed conservatively in a long-sleeved striped shirt, brown pants and carried a matching handbag. But her "bad boy" boyfriend wore a T-shirt to show off his new tat, and styled dark skinny jeans.