SAN DIEGO, July 13 (UPI) -- The wizarding world of Harry Potter and Westeros became one during Comic Con.
Williams, who plays Arya Stark on the popular HBO show, posted a photograph with Radcliffe and her two co-stars, Hannah Murray and Jenna Coleman.
The actress wrote: "I think this photo is gonna make the world implode..... Last night was really great #sdcc2015"
Last week, Williams also bumped into another famous face during the convention and couldn't help but ask for a picture. The 18-year-old stood next to Bill Murray and shared the dialogue that was exchanged between the two stars.
"Would you mind if I got a picture with you? Yeah sure, I guess I'll just hold up these Cheetos Sure, I don't mind *silence*," she wrote.