By Will Robinson
October 21, 2016 at 12:00 PM EDT
David M. Benett/Dave Benett/Getty Images; Steve Granitz/WireImage

J.K. Rowling’s fandom of Amy Schumer knows no bounds. After the Harry Potter author stepped into the comedian’s Scottish stand-up show — and raved about it — Rowling picked up and raved about Schumer’s book The Girl With the Lower Back Tattoo.

“This is the most I’ve ever laughed out loud at a book,” Rowling tweeted at Schumer on Friday night.

Rowling saw Schumer at the end of August and sung her praises: “Just seen the goddess that is @amyschumer live in Edinburgh. What a night,” she wrote at the time. Schumer replied: “Thank you so much! Did you like my sister’s gryffindor hat?!”

The Girl With the Lower Back Tattoo was praised upon its release, from critics and Schumer’s peers alike. Chris Rock, Brie Larson, and Aziz Ansari were among those who picked up Schumer’s work and declared their love for it.