2012 Teen Choice Awards best and worst moments

Carly Rae Jepsen closed out the 2012 TCAs with her summer anthem "Call Me Maybe," and it must be said that the 27-year-old Justin Bieber protege is evolving into a true performer. It was especially cool when she took her mic into the crowd and got a little help from Sophia Grace and Rosie.

-- Liz Kelly Nelson, Zap2it