Harry Potter and the Cursed Child / Facebook 1 / 8
Harry Potter and the Cursed Child / Facebook 1 / 8

Ben Affleck and his daughter Violet Affleck may have had the best daddy-daughter day ever.

Over the weekend, the "Batman v Superman" star took his oldest child to see the "Harry Potter and the Cursed Child" stage play in London's West End theater district.

Afterwards, she even got to meet and hang out with the cast. The show shared pictures of the pair backstage on its Facebook account.

Ben and Violet were hardly the only notable names there. His "Suicide Squad" costar Margot Robbie and "Glee" alum Darren Criss were also in attendance at the popular show.

"Margot Robbie, Ben Affleck and Darren Criss met the cast of Harry Potter and the Cursed Child this weekend at the Palace Theatre, London. #KeepTheSecrets," the show's official Facebook account said, sharing two photos from the evening.

In one snap with what looks to be the entire cast, Ben and Violent smile as they stand toward the left of the cast. The actor wears a leather jacket while Violet rocks a jean skirt and buttoned-down shirt and a jacket.

The two hold hands as Ben and Jennifer Garner's daughter stands in front of her dad.

Ben and his family's love of "Harry Potter" is fairly well known. In August 2015, he and the family celebrated his 43rd birthday at Universal Orlando's hugely popular Wizarding World of Harry Potter.

A few months later, he was photographed donning a shirt with character Sirius Black on it while taking a break during the filming of a movie in Los Angeles.

Ben, Margot and Darren not withstanding, the West End show has been a hub of celebrities, but perhaps there wasn't an appearance more celebrated that when Emma Watson checked it out in July.

Emma played Muggle-born witch Hermione Granger in eight "Harry Potter" films.

"Yesterday I went to see the Cursed Child. I came in with no idea what to expect and it was AMAZING," she wrote on Facebook on July 8. "Some things about the play were, I think, possibly even more beautiful than the films. Having seen it I felt more connected to Hermione and the stories than I have since Deathly Hallows came out, which was such a gift."