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 scores a new top 10 hit on the U.K. songs chart alongside Charli XCX with “Sympathy is a Knife,” which is a huge smash now that it's a duet.

Ariana Grande is apologizing after Cassandra Peterson, who plays horror character Elvira, recalled a bad encounter with the singer.