July 31 is the most famous fictional birthday in contemporary literature: Harry Potter’s birthday. Strange, magical, sometimes wonderful things tend to happen on that day. It’s also his creator, J.K. Rowling’s birthday. And since we couldn’t reach Harry, Ron and Hermione to wish her many happy returns (they must be hiding under their invisibility cloak), we did the next best thing: we invited the stars of the HP movie franchise to send her birthday greetings. As far as we know, none of these messages were delivered by owl.

Read next: The 50 Most Important Things We’ve Learned From J.K. Rowling

More Must-Reads From TIME

Contact us at letters@time.com.

Read More From TIME