Happy 18th birthday, Lorde!
Yes, it's hard to believe that the New Zealand wunderkind is only now an adult. Just ask BFF Taylor Swift!
On Friday, the 24-year-old "Shake It Off" singer Instagrammed a celebratory selfie with the B-day girl, who is talented (and apparently wise) well beyond her years. "It's Ella's 18th birthday technically," wrote Taylor, referring to Lorde by her real first name, "but we all know she's really 300 and knows all the secrets of the universe. #ELLAflickebeat"