What have you been up to since we last spoke?
"The album! I've done a few shows but it's been pretty much all about the album. I've been working on it for almost four years now, since I was 14 really, but it's finally almost finished."
Is the current plan for a January 2011 release?
"Yeah. Do you prefer January 1 or January 11? I'm kinda up in the air about that."
When do you have to decide the final tracklisting?
"By the end of month. That's all coming together now and everyone's two cents are going into it!"
Apparently you wanted the album to be 12 tracks from 12 different producers, but the label vetoed that idea...
"Haha yes! That would have been really cool - at least I thought that would have been really cool - but people at the label weren't so keen. It's still going to be really varied though and there's still going to be tracks from lots of different producers on there. Stuff I've done with Bloodshy & Avant, Paul Epworth, Greg Kurstin and Ryan Tedder will definitely make the final cut."
What made you pick 'One' as the first single?
"Well, at first I didn't even know it was going to be the single, but it's always been a song I was really into, so I'm glad it's turned out that way. I think it's a good introduction to the album actually - it's poppy but it's unique. I don't think it sounds like anything else around at the moment."
What's the story behind the song?
"It's about being in a relationship where you're ignored - any type of relationship, not necessarily romantic. It's about that point where you don't feel anything - you don't feel happy, you don't feel sad but you want to feel something. It's a situation I was in and I think everyone's been in. There's always someone in a relationship who wants more attention and starts trying too hard to please the other person. The thing is, the more you try to please that person, the less effort they make because they know you'll do anything they want. It's that stage I'm singing about on 'One'."
What's the response been like so far?
"Good, but I don't think people really listen to the lyrics. They're just like, 'One, one, one, one one...' I don't really care though - if you want to listen to the lyrics, you can, but if you don't, you don't have to. As long as you like the song I'm good! The song's got a sad concept but I put it with a happy beat and a pretty happy melody, which I think balances it and stops it being depressing."
Do you have any idea yet what the second single's going to be?
"I'm guessing it's going to be the one coming out as the first American single, which is a song I did with Ryan Tedder called 'Obsession'. We didn't think 'One' would catch on as fast in America, whereas hopefully something like 'Obsession' will. It's got more of a radio-friendly sound from an American point of view, so hopefully it will open the door for me to come out with stuff like 'One' over there in the future, because then I'll have more of a name."
How frustrating is it being compared to other female artists?
"It gets very frustrating and it recently made me snap during an interview. I wasn't mean about it, but I did I have my say. I was like, 'I was out before half of these people you're comparing me to. I might not have been on the radio but I built a solid fan-base first'. There are people that I predated and these writers and bloggers are saying I copied them - how?"
What's the most ridiculous comparison you've heard?
"Marina and the Diamonds. I really like her but I don't think we're anything alike. I sing, 'I am not a robot but I feel like one' in 'One', but I wrote that song a year-and-half ago in Stockholm, before I'd even heard of Marina and the Diamonds. That's not even the point though because the songs have completely different concepts and musically me and her are nothing alike. Then there's Ke$ha, Lady GaGa, Daisy Dares You... it's tired and a little bit annoying. I'm like, 'Can't you just listen to me like you listened to these girls when they came out?'"
Right, onto the really big issues. Why do you have Justin Bieber as the main picture on your Twitter profile?
"It's just such a funny picture - Bieber with Shaquille O'Neal! I do love him though. I've been a fan since he used to post his homemade videos on YouTube back in the day. His music's not really my thing but I think he's got a good voice - you know, some people don't even have that now."
What's his appeal, do you think?
"He seems so wholesome but at the same time he seems like such a little player! He's totally got a ladies' man thing going on - I've seen him hit on fans in interviews. He's Mr Smooth and that's so funny to me. It's weird too because I feel like he's a little boy next to me even though we're basically the same age. I just turned 18, and I'm guessing he's like 16 or 17, but he seems so much younger. I feel like we're years apart."
Would you like to meet him?
"I'd love to meet Justin Bieber! Wouldn't you love to meet Justin Bieber? I'd love to write a song for Justin Bieber actually. If I have a person in mind, I write a song that fits them. I write towards the person. I don't write for me and then give it to someone else. When I write songs for myself it's really personal and I just can't have someone else singing it."
Have you been writing for anyone else recently?
"Well, I was supposed to write for Jedward. They wanted me to but it never happened. I never spoke to anyone who worked with them, just them directly. Their album's a lot of covers, right?"
Every song's a cover, yes. Have you heard any of it?
"No, but it's totally a personality thing with me. They're characters and I appreciate that. They're so nice too. I've never officially met them, but they take turns to email me because they actually share a BlackBerry. At first I thought it was fake, that someone was f***ing with me, but then I watched them in interviews and realised it was really them!"
'One' by Sky Ferreira is released on August 23.
Additional reporting by Philippa Warr