The little cutie is currently traveling through Thailand with her family and Teigen, 33, snapped a precious photo of her wearing a pink swimsuit and posing on top of a rock on the beach.
“Oh dear @mj_day,” Teigen captioned the photo, tagging an editor at Sports Illustrated.
The editor commented on the post, writing along with a series of laughing emojis: “Effortless beauty [check] Chic suit [check] Owns that rock [check] TOE POINT [check] #callmeLuna."
Proud dad Legend wrote, “I’m the @yutsai of Instagram dads,” referencing a photographer, but Teigen replied, “@johnlegend I took this.”
Not to be one-upped, Legend replied, “@chrissyteigen true, you took it from me.”
Teigen appeared in the Sports Illustrated Swimsuit Issue from 2010 to 2017, and posed on the cover in 2014 alongside Nina Agdal and Lily Aldridge.
The mother of two also shared a cute snap of herself with her and Legend's 1-year-old son, Miles, posing on the beach and another of him and Luna together with his big sister in a large pot.
The family has been enjoying a group trip to Thailand with Teigen’s mom, Vilailuck Teigen, who is Thai.
Earlier in the week the entire family dressed up in stunning traditional garb. When one fan asked what the special occasion was, Teigen jokingly replied, “Just Tuesday.”
For more from the cute family, watch the clip below: