Spotted: "Gossip Girl" actress Blake Lively looking very pregnant in a photo posted Monday to her lifestyle site, Preserve.

Lively, 27, made the low-key announcement by sharing a picture of herself cradling her tiny bump. It's the last in a series of images of expectant women that illustrates the theme of the site's fall issue: Family.

"With family on our mind, we looked to the origin of it all -- to the women in our lives who are right there, at that special moment; at the creation of family. ... Congratulations to all the expecting mothers out there," Preserve's home page reads, without explicitly mentioning its founder's pregnancy.

This will be the first child for Lively and her husband of two years, "Green Lantern" star Ryan Reynolds, 37.