The pop star will perform in London on Tuesday (September 27)
Star speaks in exclusive NME interview
Apple Music Festival headliner tells NME the early songs on ‘Glory’ ‘weren’t that great’ before she became 'selfish'
Singer says she relies on other people to give their verdict about her music
The original version of the singer's 'Make Me' video was scrapped and a new clip was made
Singer speaks in new interview
Spears' 'Carpool Karaoke' appearance is online in full
The star has not given the Lifetime movie her blessing, however
Pair also sing 'Toxic' in teaser video ahead of full segment on Thursday