It's official: Mermaids really are having a moment with the celebrity baby set.First, North West celebrated her third birthday with a pool party fit for Ariel . Now, Luna Legend is getting in on the underwater action on Snapchat. Spoiler: It's so freaking adorable we can't handle it.Chrissy Teigen shared a photo of her infant daughter rocking a knit mermaid tail and bikini. According to the caption, the aqua ensemble came courtesy of Vita Coco.