It's only been three years since Lorde released her debut album - meaning that there hasn't been an excessive gap between albums - but nonetheless, fans have been very impatient waiting for the follow-up to 'Pure Heroine'.

The good news is that the New Zealand pop star has revealed that she has written her second album and she is currently in New York, recording it.

Along with several pictures featuring her bestie Taylor Swift as well as Gigi Hadid and comedian Aziz Ansari, she posted a lengthy open letter to fans on Facebook yesterday - on her 20th birthday - talking about how last year she "made a very deliberate choice to withdraw for a little while from a public life."

"I haven’t had my hair or makeup done in a year, the free handbags dried up LONG ago, and the paparazzi at the airport are almost always for someone else," she wrote "And let me tell you, as much as I love being full noise album cycle girl, it’s been a motherfucking joy."

She added that she had been through a lot of experiences: "My heart broke. I moved out of home and into the city and I made new friends and started to realize that no one is just good or bad, that everyone is both. I started to discover in a profound, scary, blood-aching way who I was when I was alone, what I did when I did things only for myself. I was reckless and graceless and terrifying and tender. I threw sprawling parties and sat in restaurants until the early hours, learning what it’s like to be an adult, even talking like one sometimes, until I caught myself. All I wanted to do was dance. I whispered into ears and let my eyes blaze on high and for the first time I felt this intimate, empire-sized inner power."

She added: "And then I wrote a record about it, all of it, so much more than what I’ve written down here, and I’m in New York getting it done."

Although there is no time frame given on when we might expect to hear it, it's a safe bet to assume the now-20-year-old will return sometime in 2017 with album number two.

Read the whole Facebook post here.

Swift also posted a gushing tribute on her own Instagram featuring a homemade card and the caption: "Thank you for the music you make, the advice you give, the thoughts you provoke, and the way you've made my life more beautiful since the first day we met up in New York and ate burgers on a park bench and got attacked by squirrels. I. Love. You. So. Much. Ella."