Whistle Tones in 'Emotions Cover' Video

Not long ago, Ariana posted a video on her youtube account of her talking about the whistle tones (super high notes) she sings in her cover of Mariah Careys 'Emotions'. She talks about the reason they are only in the studio version and not the live version because some people have been thinking she was faking it (she was not). Ariana also does some whistle tones in the video to show they are real and what they sound like, here it is-