Dylan O'Brien's birthday video for his "Love and Monsters" co-star Ariana Greenblatt

Dylan O'Brien participated in a Birthday video for Ariana Greenblatt his co-star in “Love and Monsters” to wish her a “Happy Birthday”. Her birthday was on August 27th, the day after Dylan’s. 🎥©: @ariana_greenblatt Instagram Story #DylanOBrien #ArianaGreenblatt #LoveandMonsters