Blake Lively has sparked speculation she is pregnant.

The Gossip Girl actress returned to the New York City set of the show this week following her September 9 wedding to Ryan Reynolds.

It has been reported those involved with the show are convinced she is having a baby because her appetite is larger than normal.

"Blake is usually really careful about what she eats, but since her wedding, she seems to be eating a lot more. Everyone on set is on bump-watch," reports New York Post.

Other sources have suggested the 25-year-old is "glowing".

Her spokesperson hasn't commented on the report.

Blake and 35-year-old Ryan caused shock when they married in South Carolina as they kept the ceremony top secret. They have still not commented on the nuptials, although Blake has been spotted wearing a huge diamond engagement ring and matching wedding band, said to be worth $2 million.

It has now been claimed that although the pair exchanged romantic vows and invited friends and family to the South Carolina ceremony, they weren't legally wed until five days later.

They apparently applied for a marriage license on September 13 and tied the knot the following day in private.