Lana Del Rey is struggling to write her new album.

The 'Summertime Sadness' hitmaker is working on the follow-up to 2012's 'Born to Die' album and admits that she never knows what to say when she's quizzed on her new work as she doesn't know what it will sound like yet.

She told ''When people ask me about it, I just have to be honest - I really don't know... I don't want to say, 'Yeah, definitely - the next one's better than this one,' because I don't really hear a next one. My muse is very fickle. She only comes to me sometimes, which is annoying.''

Lana - real name Elizabeth Woolridge Grant - was catapulted to the spotlight following the success of her debut single 'Video Games' in June 2011 and has since found it harder to source inspiration from the ''outside world.''

She explained: ''It's harder to be an observer when people are watching you. You have to go further inside because the outside world becomes a harder place to draw from.''