The Only Girl singer said that she had to tone up for her forthcoming role in action film Battleship, and admitted that the process helped her make peace with her figure.
She told Vogue magazine: 'For the first time, I don't want to get rid of the curves. I just want to tone it up.
'My body is comfortable, and it's not unhealthy, so I'm going to rock with it.'
She added: 'Over the holidays, and even during filming, I realised that I actually like my body, even if it's not perfect according to the book. I just feel sexy.'