It all started when the HP author sent out a tweet on August 30, after she saw Schumer's live stand-up show. "Just seen the goddess that is @amyschumer live in Edinburgh. What a night," she wrote.
Schumer politely thanked her, asking if she liked her sister's accessory, a Gryffindor hat she must have been wearing during the show. The headwear was a hit with Rowling, who tweeted back, "I *loved* the Gryffindor hat." So now we know that Schumer's sis would share a house with Harry, Ron, and Hermione. The real question is: Which house would the sorting hat choose for Schumer? Maybe her new bestie will let us know — in a tweet, of course.