The singer, who is to married British comedian Russell Brand, sparked speculation that she could be in the baby way by wearing an outfit that seemed to show a little bump at the American Music Awards.
But the 27-year-old said the bump has more to do with her love of fast food than anything else.
Asked if she was expecting by Hollyscoop, she replied, 'Hell, no!'
'I like In-N-Out Burger and Taco Bell and if you want to make that pregnant that's your problem,' she added to The Insider. 'I still love drinking alcohol so not yet.'
And whilst performing at Madison Square Garden last week, she joked that if she rubbed her 'bloated belly', it wasn't because she was pregnant – she'd just been having a great time getting stuck into New York's delicious food.