PHOTO GALLERY: Blake Lively Kids Around on Set

No, Blake Lively hasn’t spawned on the sly—the Gossip Girl beauty was merely holding a tot while filming a backyard barbecue scene for The Town in Boston with her co-star Ben Affleck on Monday.

The film, about a gang of four thieves being hunted down by a tenacious FBI agent—also stars Mad Men’s Jon Hamm.

Click through our gallery and let us know in the comments section: Do you think Blake and Ben will have believable on-screen chemistry?