John Legend would do anything for his kids — except, perhaps, let them design his next tattoo.Chrissy Teigen sat down with Ellen DeGeneres on Tuesday — while promoting her new book and reflected on how she wound up with an adorable cartoon drawing of a butterfly on her forearm, which was sketched by her 5-year-old daughter, Luna.«Luna was drawing on us one night, and then she was like, 'This is the best butterfly I've ever drawn!' and I was like, 'I agree!'» Teigen recounted.