Song isn't thought to be in the running for singer's 'Ultraviolence' album
Singer will perform at Worthy Farm on June 28
Tourdates suggest album number two will be released in spring
Del Rey tweeted a picture of herself on the lap of the rock frontman
Singer accidentally lets release date slip to fans in a US street
Singer also says her second album is 'so dark it's almost unlistenable'
Singer records theme song from the soundtrack to new Disney film 'Maleficient'
The singer will reportedly reveal 'Once Upon A Dream' after the ceremony is over
A fake article saying her 'Great Gatsby' song had been disqualified from the Oscars Best Original Song category was circulated
The 30-minute film also stars actor Shaun Ross