Pop star will release her new album in November, with a single due in August
Apple has refused to comment on reports that the singer has been added to the line-up
'Harmful' details about the singer said to be included in files from 2010 legal battle
Singer makes first official appearance since suffering hip injury
Beyonce is at Number Two and Madonna is Number Three on the list
Knob-twiddler Zedd says 'ARTPOP' will be 'experimental'
Flamboyant twosome pictured with hat designer Philip Treacy
The 'Born This Way' singer refused to appear at last year's US political event
Gaga's hip injury won't put a stop to planned sessions, says crooner
'Born This Way' star's team want recompensing for scrapped gig