Twilight's Kristen Stewart joked about reports she was expecting co-star Robert Pattinson's baby during an appearance at the Comic-Con convention yesterday.

Last month, an Australian tabloid carried a story which appeared to show Stewart with a baby bump on the set of new film The Runaways.

The actress's publicist had already denied the claims, but that didn't stop Stewart from joking about them yesterday.

When asked by a fan what type of roles she was looking forward to in future movies, Stewart replied: "I can't wait to actually get pregnant.”

The actress was joined by Pattinson and fellow Twilight co-star Taylor Lautner at the convention in San Francisco.

The trio fielded questions from fans about the forthcoming Twilight film, New Moon, which is released in November.

Twilight stars hit Comic-Con