LONDON -- Harry Potter's greatest puberty success story has apparently met cult television's latest hero.

Actor Matthew Lewis -- aka Neville Longbottom in the Harry Potterfilm series -- shared an Instagram post featuring Millie Bobby Brown,Lisa Ann - Sexual Intrigue (2008) the Stranger Thingsactress who plays Eleven.

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And if that information wasn't mind-boggling enough, check out the tattoo on Lewis' arm and be amazed:

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Mind. Blown. WHAT DOES THIS ALL MEAN?!

Topics Harry Potter Instagram Stranger Things