By Kelsey Glein
Nov 07, 2014 @ 11:02 am

Taylor Swift just confirmed what we already knew—that Lorde is wise well beyond her years. Today marks the soulful singer's 18th birthday, and Swift celebrated her BFF with a touching (and hilarious) tribute on Instagram.

RELATED: Birthday Girl Lorde's Best Quotes on Fashion, Beauty, and Life

"It's Ella's 18th birthday technically but we all know she's really 300 and knows all the secrets of the universe. #ELLAflickerbeat," Swift captioned a cute photo of the pair, addressing the birthday girl by her real first name. Lorde responded to the message on Twitter shortly after by confessing to her old age: "@taylorswift13 my tiny wizened old lady heart adores you."

RELATED: See the Music Video for Lorde's "Yellow Flicker Beat"

We love this duo, and we're wishing Lorde a happy 300th birthday as well!

PHOTOS: 58 Reasons Why Taylor Swift is a Street Style Pro