2:23 PM PT -- Ariana Grande is issuing a public apology to Elvira after the Mistress of the Dark called out the pop star for some alleged bad behavior many years ago.

After Elvira's criticism went viral, with the TV personality even sharing one article about the drama on her Instagram feed, the singer took to the comments and shared her side of the story.

She wrote ... "i’m so disheartened to see this. i actually don’t even remember getting the chance to meet you because i had an anxiety attack and to my memory, left before the rest of my family (this was around 7 years ago and at the time i was really not great with being in public crowds or loud places)… but if i’m misremembering this moment, i sincerely apologize for offending you so."

Ariana went on to thank Elvira for being so kind to her family, noting her mom had nothing but nice things to say about her. She added ... "she might have different feelings about that now but i’ll talk to her… clearly, we all have our days!"

The Grammy winner signed of her apology by praising Elvira as the "queen of Halloween."

"Thank u, next" to this drama, it appears!!!

Ariana Grande may play Glinda the Good Witch in the "Wicked" musical movie ... but Elvira, the Mistress of the Dark, is calling her out on some alleged diva behavior.

The Queen of Halloween participated in a Q&A at Knott's Scary Farm in Buena Park, California recently ... where she was asked about her past celebrity experiences, including one with the pop diva.

As Elvira put it ... the singer attended one of her events with around 20 guests -- free of charge -- and even came backstage to meet the TV personality.

During the encounter, Ariana asked Elvira if her loved ones could take a series of pictures with the horror hostess ... a request Elvira happily obliged.

However, when Elvira asked for a similar photo with Ari ... the chart-topper essentially told her "thank u, next." Specifically, Elvira recalled Ariana shooting her down and saying, "No, I don’t really do that."

Elvira added ... "Then she left before my show started. All her relatives stayed and she took off. I'm just sayin'."

Elvira's admission has since sparked strong reactions on social media ... with some siding with the Mistress of Darkness, claiming this was worse than Ariana's infamous donut-licking incident.

Yet, others have sided with Ariana, defending her rejection wasn't that big of a deal ... with some even asking, "who's elvira?"

Despite the criticism, Ariana is still bound to be as "Popular" as ever when "Wicked" hits theaters this November!!!