The ceremony will take place in New York on September 11
The pop star also told the crowd: "Outside Lands it's like thou art inside me" in a medieval-inspired 'Nonsense' outro
"They trusted me in the end, and I was happy that I believed in myself"
Sabrina Carpenter, Eminem and Ariana Grande have six nominations apiece too
The new track comes off of her forthcoming album, 'Short n' Sweet'
The four new dates include another slot at London’s O2
O2 and Virgin Media broadband customers can get access to presale tickets 48 hours before general release – only on Priority from O2
Rachel Chinouriri will join her at all eight dates as a special guest
It sees the singer share what she’s most excited for at the Games of the XXXIII Olympiad
“The rumours are true! Sabrina Carpenter is my niece!"