What went down between Elvira and Ariana Grande? This slow-simmering beef came to light at a Knott's Scary Farm event that Peterson made an appearance at over the weekend of Oct.

Elvira had named Ariana Grande as her worst celebrity encounter. Now, the singer is apologizing to the Mistress of the Dark.

After an audible gasp and boos from the audience, Elvira added that Grande also added salt to the wound by leaving the show before it started -- though her 20 guests stayed behind to enjoy it.

Ariana Grande has apologized to Elvira after the horror hostess shared an encounter where the pop singer was allegedly disrespectful towards her.

At the behest of a fan, Elvira told of a dark and stormy night when Ariana Grande asked for 21 comp tickets to an Elvira event. “She comes backstage and asked if I could take pictures with all her friends and relatives she brought,” Elvira said. “I took a picture with every single one of them. I signed autographs for every single one of them.”

Ariana Grande is responding to Cassandra “Elvira” Peterson’s accusations that she had a bad experience with the pop star. In a now-viral video, Peterson claimed the singer had requested tickets to an Elvira show for her friends and family but rejected Peterson’s request to get a photo together after Peterson took pictures and signed autographs for Grande’s guests.

Ariana Grande waved the white flag following recent drama with the iconic Elvira, the Mistress of the Dark. The singer apologized and cleared the air after Elvira—whose real name is Cassandra Peterson—mentioned the pop star’s name when she was asked about her worst celebrity encounters.