• Kaley Cuoco-Sweeting

Kaley Cuoco-Sweeting (Photo : Instagram)

"The Big Bang Theory" star Kaley Cuoco-Sweeting and husband Ryan Sweeting is rumored to be expecting their first child together.

Cuoco-Sweeting, who plays the role of Penny on the hit CBS series, posted a photo with her husband via Instagram. In the snap, the actress reportedly looks more plump than usual.

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Some of Cuoco-Sweeting's followers on the social media site also commented that the actress looks pregnant. Others commented that the actress' attire did not flatter her physique.

In another post, "The Big Bang Theory" star and Sweeting were photographed enjoying a meal together. One fan commented that the actress seems to have a huge appetite.

Meanwhile, Cuoco-Sweeting has not yet responded to rumors about her alleged pregnancy. The actress is currently busy filming episodes for the upcoming ninth season of the hit ABC series.

During an interview with Entertainment Tonight, she revealed that cast of "The Big Bang Theory" have already filmed three episodes for season 9. The actress also said that she is looking forward to what lies ahead between Penny and Leonard.

In season 8, Penny and Leonard were on their way to Las Vegas to wed when the latter confessed about his infidelity. Although Penny took the revelation in stride, it seems that she is still greatly affected by Leonard's confession.

The premiere episode for season 9 entitled "The Matrimony Momentum" would finally give fans an insight as to whether or not the onscreen couple wed.

"The Big Bang Theory" season 9 will premiere on CBS on Sept. 21 at 8 p.m. ET.