Teenage singer poses for a picture with Kansas City Royals veteran George Brett in Las Vegas
In a series of tweets, which have since been deleted, the singer also asks audience members to wear rainbow colors in support of gay rights
US singer covered Number One hit during recent Auckland show
The song is taken from the producer's forthcoming EP
The New Zealand born singer's manager says she will play 16 dates stateside
Pop star also performs cover of Son Lux's 'Easy' at Auckland event
The 17-year-old singer takes to Twitter to vent her anger following double Grammy Awards victory
The 17-year-old singer has spoken out about her fellow Grammys nominees
The 17-year-old singer is against fans calling themselves ‘The Disciples’
Singer recalls moment she met iconic star in November 2013
New Zealand star says she takes particular offence at the term but is 'sex-positive'
The New Zealand native has received four Grammy nominations
New Zealand singer also shares her top ten tracks of 2013
Teenage singer-songwriter praises "innate catchiness" of 'One Love'
The clips shows the singer fronting rock band Extreme
Singer is also set to collaborate and pen songs for other artists
The track will appear on 'The Hunger Games: Catching Fire' soundtrack
The chart-topping singer wrote a blog post around her 17th birthday
The rapper adds new verses to the Number One song
Meanwhile, Katy Perry bags second UK Number One with 'Prism'