Christina Aguilera's three-year-old son Max is so "protective" of his pop star mom, he refuses to let anyone touch her without his permission.
The hitmaker admits her little boy has yet to grasp the fact that his mother is a superstar and he's constantly scolding anyone who gets too close for comfort.
During an appearance on late night show "Jimmy Kimmel Live!" on Thursday, she says, "If he was here right now, when you shook my hand (to greet me) he'd be like, 'No! Don't touch my (mommy's) hand.'
"He doesn't get the whole thing yet that like mommy is a public personality. So he's very protective. When I'm getting my make-up done and things like that, he's like, 'No! Don't touch!' And then he cuddles with me."
Max is Aguilera's son with estranged husband Jordan Bratman.

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