Pop star Jesse McCartney
is proving he's not just another pretty face by expanding his voice-over rsum. The 23-year-old heartthrob has already racked up several Video Game credits and provides the high-pitched squeals of Theodore in the Alvin And The Chipmunks
movies. Now he's now suiting up as Batman's crime fighting apprentice, Robin, in Cartoon Network's Young Justice
. The new series (which had a sneak preview in November
and now ...