The animal rights organisation claims animals used in promo were likely subjected to abuse
The track also marks the singer's fastest-selling UK single of her career
Perry says 'Killer Queen' helped her discover music and boosted her self-confidence
Singer reveals jungle-themed clip for new single
The single is the first to be taken from her new album 'Roar'
Pop banger will now be available to download from September – a week earlier than originally planned
Fans can hear 30-second clips of 'Dark Horse' and 'Walking On Air'
Icona Pop and Iggy Azalea will support at September 30 date
Chart battle sees Perry lead sales by 2:1 in the US
Moombahton producer says singer copied his video...