We asked the kids the same question but got two different answers. Neither child heard the other's response; these are their genuine, uninfluenced answers.
Kyle: You're pretty.
Isabel: I know.
Kyle: How do you know?
Isabel: Because I looked in the mirror.
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Jacqui: You're so cute.
Zak: I know.
Jacqui: How do you know?
Zak: Because I smart.