Leaked: Adele's James Bond Skyfall theme song

The official theme song for the upcoming 23rd James Bond film of the same name has been leaked online just days before its intended world premiere.

British singing sensation Adele works her famous pipes in a similar style to classic Bond chanteuse Dame Shirley Bassey, who memorably warbled 'Goldfinger' and 'Diamonds Are Forever'.

The track, penned by Adele with collaborator Paul Epworth, was due for release on Friday, October 5, and will still be available for download and purchase from that date.

Adele recently said she was "a little hesitant" to do the theme tune for Daniel Craig's third outing as 007.

"There's a lot of instant spotlight and pressure when it comes to a Bond song," Adele said in a statement.

"But I fell in love with the script and Paul had some great ideas for the track and it ended up being a bit of a no-brainer to do it in the end ... I'll be back combing my hair when I'm 60 telling people I was a Bond girl back in the day I'm sure!"

The song was recorded at Abbey Road Studios in London with a 77-piece orchestra.

'Skyfall' also marks the first recording the 24-year-old singer has released since her 24 million-selling smash album 21.

Skyfall is in cinemas November 22.