Credit: lordemusic/Instagram

Lorde turned 20 on Monday, and pal Taylor Swift threw her a birthday party in New York City, where they met over Shake Shack burgers just a few years ago.

“Had the best birthday party i’ve ever had tonight surrounded by my nyc family,” Lorde wrote in an Instagram post, “all organised by tay who is as she says ‘a mom with no kids.’ i am ur kid and u love me so hard i could burst.”

Mae Whitman, Aziz Ansari, Lena Dunham, Karlie Kloss, Jack Antonoff, Rachel Antonoff, and Tavi Gevinson all attended Monday’s party, which featured balloons spelling out “UR 20.”

The party followed a beautiful note from Lorde, who wrote to fans on Sunday evening, explaining the contents of her second album. “Writing Pure Heroine was my way of enshrining our teenage glory, putting it up in lights forever so that part of me never dies, and this record — well, this one is about what comes next,” she wrote. “I want nothing more than to spill my guts RIGHT NOW about the whole thing — I want you to see the album cover, pore over the lyrics (the best I’ve written in my life), touch the merch, experience the live show. I can hardly stop myself from typing out the name. I just need to keep working a while longer to make it as good as it can be. You’ll have to hold on. The big day is not tomorrow, or even next month realistically, but soon. I know you understand.”