?Stranger Things? star Millie Bobby Brown posed with Matthew Lewis and his tattoo on Sunday. The ?Harry Potter? star joked on Instagram with the caption: ?A lot of people ask what my tattoo means. Now you know.? In case you?re not obsessed with ?Stranger Things? yet, Brown?s character is named Eleven, which matches Lewis? roman numeral tattoo. Although Lewis got the tattoo long before the Netflix show aired, the joke was perfect for both ?Stranger Things? and ?Harry Potter? fans alike.