Speculation mounted that the singer, who is dating Brody Jenner, was expecting after she was spotted wearing a baggy top over the weekend.
But Lavigne, 27, insisted that the claims are totally untrue.
“Oh my god! I was out getting my nails done with my girlfriend and I had a poncho on,” she told Access Hollywood Live. “There was a whole thing online that I was pregnant.
“I’m like, 'How insulting!’ So no, I’m not. Obviously!”
And she added that she has no plans to start a family ‘anytime soon’ with Jenner, who she has been with for two years.