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.

Ariana Grande apologized to actor Cassandra Peterson — better known as horror movie host Elvira, Mistress of the Dark — after Peterson described feeling snubbed after meeting Grande years ago.

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

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’s apology to Elvira recently stirred up a lot of attention after the horror hostess shared details of a less-than-pleasant encounter with the singer. Elvira revealed this incident during a Q&A session at Knott’s Scary Farm,

Mistress of the Dark Elvira didn't hesitate to share candid details when asked about her celebrity encounters.

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.”

Cassandra Peterson, a.k.a. Elvira, is making waves on social media after a video from a recent event went viral in which Peterson recounted that Ariana Grande once brought several family members and friends to an event and asked Peterson to take photos with everyone — but declined to take a picture with Peterson.