The 30-year-old "Maneater" singer insists she won't try to make herself appear younger in order to boost her career and would rather enjoy tea and biscuits than undertake a gruelling exercise regime.
She said: "I am not ready to adjust physically, just to be marketable. My sell-by date will run out eventually.
"Unlike Madonna, I wouldn't be willing to do Pilates round the clock, just to slow down the deterioration of my body. I prefer to sit in the kitchen, drink tea and eat biscuits."