25. Erin Wasson's Mystery Mark
Tatted model and actress Erin Wasson has too many tattoos to pick just one for the list—all sneakily hidden for the most part. Her latest on her chest (we're not sure of the meaning) makes our list due to its ethereal, gentle lines. And Wasson credited the artist on her Instagram (@dr_woo_ssc). We know our first stop next time we're in Los Angeles.