Lorde has announced her first single in two years.

The 'Royals' hitmaker took to social media to confirm she would be releasing 'Green Light', her first track since 2014's 'Yellow Flicker Beat', on March 2.

She wrote on Twitter: "i am so overjoyed to finally announce that my first single, GREEN LIGHT, is coming out tomorrow at 8am nz / 2pm nyc ...

"i am so proud of this song. it's very different, and kinda unexpected. it's complex and funny and sad and joyous and it'll make you DANCE ...

"it's the first chapter of a story i'm gonna tell you, the story of the last 2 wild, fluorescent years of my life. this is where we begin ...

"GREEN LIGHT debuts with a video directed by the inimitable @grant_singer - tomorrow, 8am nz / 2pm nyc (sic)"

It comes after the 20-year-old singer - whose real name is Ella Yelich-O'Connor - installed clues around her hometown of Auckland in New Zealand to reveal the name of the new track.

She installed artwork at Herne Bay, Ponsonby and Auckland town hall, which included a car lit up with a green light that had smoke coming out of it. The words 'I do my makeup in someone else's car' were posted on one of the car windows.

Meanwhile, at the town hall, the single's title was projected onto a wall, whilst a short video was on repeat with two dates on it.

Lorde first teased new music as she penned a lengthy message on her Facebook account to celebrate her birthday.

She wrote at the time: "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. 

"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. (sic)"