Black Eyed Peas star Fergie has revealed she would love to go on a diet, but is too easily led astray by temptation. She said people often think she is pregnant because she piles on the pounds. The singer told Allure magazine, 'I think people think that I'm pregnant sometimes because my weight fluctuates. I gain and lose weight everywhere from the thighs up. My problem is my discipline. I see a Jack in the Box or a DelTaco, and I will impulsively want it. I'm a work in progress in that area.' She also laughed off claims she's had plastic surgery in an interview with the fashion publication. Fergie, 36, said, 'I did two major drastic things, which is hair to the side, it was the first time, and the big neon lip. I wanted to try something different, and all of a sudden it was this big backlash. People were saying 'It's a fake Fergie.' I heard about some ridiculous amount of money that I spent on my face, which I think is absolutely insane.' Pictured: Fergie Splash News and Picture Agency does not claim any Copyright or License in the attached material. Any downloading fees charged by Splash are for Splash's services only, and do not, nor are they intended to, convey to the user any Copyright or License in the material. By publishing this material , the user expressly agrees to indemnify and to hold Splash harmless from any claims, demands, or causes of action arising out of or connected in any way with user's publication of the material.