My wife tried it once, woke up in the middle of the night, went in the kitchen, cooked a complete meal, went back to bed, got up the next morning and remembered nothing. If the house and car keys had not been hidden in an unusual place just in case of such a reaction, she could well have sleepwalked to the car and then sleep-drove. Bottom line: KK should have known better, but celebrities rarely do.
That word, celebrities. May I assume you have a rather loose definition of that word?