The country music star says she loves nothing more than hanging out with Justin Bieber's 19-year-old girlfriend.
'She's like my little sister. I have never had such a truly sister-like relationship with someone. It is really amazing to have [had] a friend for that long,” she said.
'We met when I was 17-18 and now I'm 21, about to turn 22, it is amazing with so much going on in our lives that we have stayed so close,' she added.
In an interview on US radio show Kidd Kraddick In The Morning, the Mine singer also admitted that she often panics if she doesn’t write a song every few weeks.
She said: 'The thought of never writing a song again is the scariest thing in the world. It's one of my top fears and I have it flashed [sic] before my eyes almost every time I go two weeks without writing a song.'