A segment aired on "Entertainment Tonight" Wednesday showed the 39-year-old ex-Playboy playmate getting her hair done before an interview.
Turning to the cameras, Smith said, "I think I might be pregnant again."
She added, "I'm not ready. (But) Howard wants to have another baby, he wants to have a little boy."
Smith was referring to Howard K. Stern, her partner and father of her three-month-old daughter Dannielyn.
A few minutes later, she realized that she may have said a little bit too much.
"I feel we should change the subject," she said, giggling.
The show reported that off-camera Smith told producers that she wasn't really pregnant, she was just kidding.