Jonas & Kimmel Parental Guidance Required

6/22/2009 3:00 AM PDT
Nick Jonas is not of legal age to do a lot of things -- and one of them is perform on "Jimmy Kimmel Live" without his parents' approval.

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When the Jonas Bros. appeared on the show back in March, Nick had to get his dad's signature on a parental consent form. Since Joe and Kevin are over 18, they were alright without it.

BTW -- Nick got $777.33 for the performance.