Julia Roberts slammed recent pregnancy rumors and said there is "no" chance of her having a fourth child on Late Show With David Letterman on Dec. 12. Credit: Jeffrey R. Staab/CBS

Putting the baby bump rumors to rest! After Julia Roberts was photographed wearing a baggy sweater, reports surfaced that she was pregnant with her fourth child. During an appearance on Late Show With David Letterman on Thursday, Dec. 12, host David Letterman kicked off the interview by questioning the 46-year-old actress about whether she has plans to add to her family.

"Have you thought about adding more to the group?" he asked.

"Oh, sure," Roberts said sarcastically.

"Any chance?" Letterman inquired.

"No," the actress replied flatly. Roberts is already mom to 9-year-old twins Hazel and Phinnaeus, and son Henry, 6, with husband Daniel Moder.

The pregnancy rumors began after the August: Osage County actress was spotted wearing a loose-fitting gray sweater outside of Moder's parents' home in L.A. on Sunday, Dec. 8. For her appearance on Late Show, however, Roberts showed off her slim figure in a black pantsuit.

The Oscar-winning star also looked stunning at the New York premiere of August: Osage County that same day. She wore a short blue Proenza Schouler dress with matching Charlotte Olympia shoes.

On the red carpet, Roberts chatted with Us Weekly about her kids' latest milestones. "They're great!" she said. "Everything they do makes me happy." When asked what being a mom means to her, the Pretty Woman star replied, "The world! Just the world."

On Late Show, Roberts complained to Letterman that she gets jealous of her kids spending time on homework rather than her after school. "God, I hate homework. I hated it when I had to do it and now I hate it when they have to do it," she said. "When they come home from school, I want them back."