Lana Del Rey's new album is ''so dark it's almost unlistenable''.

The 'Born to Die' singer has completed work on her second record, 'Ultra' and warned fans it will not be particularly cheerful.

According to MTV, she told fans in an online chat: ''The record is finished and it's beautiful.

''And don't worry you will love 'Ultra' - it's so wrong and exquisite.

''It is absolutely gorgeous - darker then the first - so dark it's almost unlistenable and wrong. But I love it. X.''

Her second album may be moody, but the US singer's personal life is certainly not, as it was recently revealed she has secret been engaged to musician Barrie-James O'Neill since last summer.

The 'Video Games' star and Barrie - previously singer in the folk-rock band Kassidy - first got together in 2011.

In a 2012 interview, Lana said her song 'Off to the Races' had been inspired by him.

She said: ''When I found somebody who I fell in love with, it made me feel different than I felt the rest of the day. It was electrifying. That's what inspired the 'Off to the Races' melodies.

''That's one of the times when you're feeling electrified by someone else and they make you happy to be alive.''