LOS ANGELES, Sept. 18 -- Millie Bobby Brown and Jake Bongiovi have shared the first glimpse of their second child, posting a photo showing their baby's hand.

People reported that the couple shared the photo in a joint Instagram post yesterday with the caption "Hi little guy!", while a source confirmed to the magazine that they had welcomed their second baby through adoption.

Representatives for Brown and Bongiovi could not be reached for comment.

The 22-year-old Stranger Things actress had appeared to hint at the couple's growing family in an Instagram post on September 7, which showed her carrying their daughter while Bongiovi walked beside her with a baby carrier strapped to his chest.

The newest addition to the family was obscured ...