Who is Helga Horton Hears a who

Helga, from Horton Hears A Who, is played by Selena Gomez.
Other things that Selena are in:
Princess Protection Programme, Plays Carter. Co-star: Demi Lovato.
Wizards Of Waverly Place, Plays Alex. Co-stars: David Deluise, Maria Canels Barbera, David Henrie and Jake .T. Austin.
'Fly To Your Heart' music video, from Tinkerbell.
She is also currently in Ramona and Beezus