Actress Julia Roberts is facing pregnancy rumors after she was recently spotted with a bigger-than-usual stomach.

According to photos published by TMZ on Monday, Roberts was photographed walking alongside her husband Danny Moder at his parents' home in Los Angeles where she appeared to be concealing her pregnant stomach with a baggy sweater. (See photos here)

Other reports indicated that while attending the 2013 BAFTA LA Jaguar Britannia Awards in November, the 46-year-old actress covered up her body in an oversized black dress. The dress also hid her torso while showing off a larger bust line than usual.

Roberts and Moder married in 2002 and are already parents to three children: 9-year-old twins Hazel and Phinnaeus, and 6-year-old Henry.

If indeed pregnant with her fourth child, Roberts won't be the first celebrity to have a baby over the age of 40. Other stars like Halle Berry, Mariah Carey and Madonna all welcomed babies at an older age and even Gwen Stefani is expecting.

Roberts may have to announce the pregnancy news soon as her next film August: Osage County is scheduled to release Christmas Day on Dec. 25. She has several promotional appearances for the movie coming up.

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The actress will also appear in the TV movie, The Normal Heart, which is set to come out next spring.

Roberts opened up to Marie Claire in November about juggling her career and motherhood, adding that her agent keeps her as busy as possible.

"As my career is slowing down, he thought, I've got to figure this out before she brings it all to a screeching halt in favour of car pools," she revealed."The things that are correct for me will come to me at the time that I am interested in them and have the capacity, the understanding, to do them."