The "Harry Potter" reunion special accidentally used a photo of Emma Roberts in lieu of Emma Watson.
The special has since corrected the error after fans pointed it out on social media.
Watson acknowledged it in a Wednesday Instagram post, joking she wasn't as cute as young Roberts.
Emma Watson nodded to a photo mix-up in HBO Max's "Harry Potter" reunion special, "Return to Hogwarts," which included a photo of actor Emma Roberts as a child instead of Watson, who played Hermione in the films.
Watson reposted the mistaken photo on Instagram on Wednesday.
"I was NOT this cute, @emmaroberts," she wrote in the post's caption. "#emmasistersforever."
The photo of a young Emma Roberts ("American Horror Story"), sitting at a table and wearing Minnie Mouse ears, temporarily appeared in the "Return to Hogwarts" reunion special to represent a young Emma Watson.
In the time since the special premiered on January 1, HBO Max has updated it and fixed the photo error, which it acknowledged in a comment to the Los Angeles Times.
"Well spotted Harry Potter fans!" an HBO Max spokesperson told The LA Times. "You brought an editing mistake of a mislabeled photograph to our attention. New version is up now."
Fans had previously caught the error and posted about it on social media, Insider reported. Roberts had originally posted the photo onto her Instagram account on February 8, 2012, and comments on that post are now full of references to its appearance in the special.
The Roberts photo wasn't the only error that HBO Max patched in the "Harry Potter" special — it had also mislabeled James and Oliver Phelps, who played the Weasley twins in the films. Tom Felton, who played Draco Malfoy in the films, jokingly took credit for the mix-up. HBO Max has since corrected that error in the special.
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