What to say when my boyfriend says to stay beautiful?

Every time I talk on the phone to my boyfriend and we're about to hang up he always says "stay beautiful". I think it's cute, but I want something to say back to him that's also cute or maybe even a little clever. It's boring to just say stuff like "ok" or "awh" back to him. Any suggestions?
What to say when my boyfriend says to stay beautiful?
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