It's been a long time since the assembled members of No Doubt were teenagers, but that didn't stop the reactivated group from showing up at last night's Nickelodeon Teen Choice Awards, doing their bubbly age-defiance thing and performing new song "Settle Down." They did not look quite as out-of-place as one might imagine. Observe below. [videoembed size="full_width" alignment="center"][/videoembed] The Pretty ...