During a recent fan event at Knott’s Berry Farm, Cassandra Peterson, also known as Elvira, Mistress Of The Dark, revealed an unfavorable past encounter with Ariana Grande. “She came and she brought 20 guests, she wanted 21 tickets,” Peterson recounted. “We gave her the tickets and she comes backstage and she asks if I can take pictures with all of her friends and relatives she brought. I take a picture with every single one of them, I sign autographs for every single one of them. Then I say to her, ‘Can we take a photo together?’ And she goes, ‘No, I don’t really do that.’ I mean, come on.” She continued: “Then she left before my show started! All her relatives stayed, and she took off.” Grande apologized to Peterson in an Instagram comment yesterday, explaining that she left early due to an “anxiety attack” but thanked Elvira for “being so nice to my mom.” She concluded with “you’ll always be our queen of halloween!” (EW)