updated 02/10/2011 AT 12:00 PM ET
•originally published 02/10/2011 AT 12:20 PM ET
While the pop star is up for favorite male singer (along with Bruno Mars, Jay-Z and Usher), Diaz is nominated for favorite voice from an animated film for her role in Shrek Forever After.
“Well, as everyone knows, the kids know their stuff, so I’m always very flattered to be their choice for anything,” Diaz tells PEOPLE exclusively. “After all these years, Fiona is very close to my heart and it’s awesome to know that kids around the world love her as much as I do.”