How adorable are The Vampire Diaries’ Nina Dobrev (Elena) and The OriginalsPhoebe Tonkin (Hayley) together? Judging by this Twitter convo, pretty darn adorable. The gal pals took to Twitter to talk spa days and costume-planning, and we were surprised at what they ended up with.

It all started with Phoebe’s Instagram pic of her and Originals co-star Danielle Campbell (Davina) getting their spa on. “Girls Day. Sauna. Taylor Swift. Magazines and face masks. Get outtaaaa here x @daniellemcam,” Phoebe tweeted, along with a pic of them with magazines and face masks.

Nina caught wind of the girls day, and wanted in: “Lets do it! Like.. Right now. Lol. My house. Wine and brainstorm session? @1PhoebeJTonkin,” Nina tweeted. Though wine didn’t seem to happen, the brainstorming did — online. Phoebe posted this photo of a costumed couple in which one person is the outlet and one person is the plug. “@ninadobrev you want to be the left or right,” she asked Nina.

Nina seemed on board with the costume idea, tweeting back, “Hahahah lets take turns/switch throughout the night!” Well, there you have it, folks! Halloween 2013: Nina and Phoebe, the outlet and the plug.

Do you think Nina and Phoebe made the right decision? What do you think they should go as for Halloween? Sound off in the comments below!

Catch the next episode of The Vampire Diaries on Thursday, October 17, 2013, at 8 p.m. ET on The CW, followed by a new episode of Reign.