BTS! pic.twitter.com/vygUCU95pF [1]

— christine teigen (@chrissyteigen) December 12, 2016 [2]

We all know that Chrissy Teigen and John Legend's daughter, Luna, is exceptionally beautiful, and thankfully, the supermodel reminds us of that fact on a weekly basis. In the eight months since Luna was born, the couple has shared so many sweet photos of her [3] with their fans on social media. While they are all cute, Chrissy's latest one punched us right in the gut for a small and simple reason. The supermodel, who stars in Target's The Toycracker [4], an eight-minute holiday film, with John, posted a behind-the-scenes snap from the shoot on Twitter on Sunday. In the photo, Luna is seen sitting on John's lap while he's still in his Rat King costume. Just look at how teeny-tiny she is! And how she fits so perfectly in his lap! We love watching Luna grow up, but now we know what people mean when they say they want their babies to stay little forever.