Cindy Crawford’s son, Presley Gerber, 18, appears to have gotten a tattoo of his sister, 16-year-old Kaia Gerber’s, name on his arm. The Roman numeral XXIII is also tattooed right under Kaia’s name.

The IMG model posted a photo of the tattoo to Instagram with the simple caption, “23.”

23

A post shared by Presley (@presleygerber) on Feb 15, 2018 at 3:23pm PST

Kaia, a fellow IMG model, posted the photo on her Instagram story and tagged her brother along with Bang Bang Tattoos artist Jonathan Valena — known as JonBoy — who has tattooed the likes of Halsey and G-Eazy

“Best big bro ever,” Kaia wrote on her Instagram story, along with three broken heart emojis.

Crawford’s two children seem to be close, often going to events, working and spending time together. Just a few weeks ago, Presley posted a throwback video of one of Crawford’s Diet Pepsi commercials, which featured Presley and Kaia when they were children.

“TBT found this in my mom’s archive — proof I’ve been a @pepsi guy since 02,” Presley captioned the video.

TBT found this in my mom’s archive — proof I’ve been a @pepsi guy since 02.

A post shared by Presley (@presleygerber) on Feb 1, 2018 at 4:38pm PST