Chrissy Teigen and John Legend are expecting their second child.
The clip gives a glimpse of Teigen's baby bump as she asks Luna, "What's in here?" The 19-month-old answers "Baby!" as she touches her mom's growing belly.
"it's john's," Teigen captioned the post.
Teigen and Legend welcomed Luna in April 2016 after conceiving via vitro fertilization.
"[It will happen in] the coming months," she said at the time.
Teigen told Entertainment Tonight in January that she and Legend will have "a little boy" next.