The singer, who reportedly once gained 14lbs in a month, said that she hates having to watch what she eats and would not rule out surgery in the future.
She told Out magazine, 'When it's time to pull and tuck, I'm sure I will consider it.'
The 29-year-old also said that when it comes to her music, she has learned to filter out negative comments from the press.
'All of my songs are f**king amazing,' she explained.
'It's such a cool feeling to hear your own song play on the radio. I still have the same kind of excitement when I hear any of my songs today.'