Who is the blonde girl on Jonas?

The song you may be referring to is "We Got The Party With Us", and the girl singing with them is Miley Cyrus a.k.a. Hannah Montana

no there is another girl to that sings with the Jonas brothers in songs like i am what i am that isn't Miley Cyrus who is she????anyone?

IT MEAGHAN JETTE MARTIN FROM CAMPROCK LOOK AT YouTube SEARCH

MEAGHAN JETTE MARTIN JONAS BROTHERS

OMGG