She claimed to be 16 when the hit song came out, turning 17 in November, right before she received her first Grammy nominations.
But, her mature singing voice, older appearance, and thoughts on feminism, have caused a lot of skepticism surrounding her age, causing many to question if Lorde is actually older than she let on.
Her gothic appearance at the Grammys probably didn't help the situation either, considering she drew meme comparisons to an elderly wicked witch.
And neither did this bit she jokingly said to Vanity Fair at a pre-Grammys party: "Hi, I'm Ella, and I'm actually 45."
To put the rumors to rest for good, bloggers over at Hairpin.com paid $17.02 to get the Grammy-winning singer's birth certificate from New Zealand.
So, what did it show?
Lorde, aka Ella Yelich O'Connor, is 17.
Meaning, after taking home Grammys for Song of the Year and Best Pop Solo Performance, she really is the third-youngest Grammy winner in history.
Take that rumorville.
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Gallery | Hilarious 2014 Grammys Memes