Katy Perry: 'Smurfs 2' is 'Really Heartfelt'

The Smurfs are back for more big-screen fun July 31, and the cast of this summer's smurfiest new flick are opening up to ET about the much-anticipated sequel.

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"The storyline is really heartfelt," explains the voice behind Smurfette, Katy Perry, whose character is kidnapped by Vladamir (Christopher Mintz-Plasse) in the film after he learns she has a secret spell that can turn the evil sorcerer's newest creation, the Naughties, into real Smurfs.

"It's like everybody goes through these, kind of, coming-of-age growing pains, questioning existence," she adds. "In some ways, she's almost, like, turning into a teenager. She's like, 'Why am I here? What am I doing?'."

Video: 'Smurfs 2' Trailer-- Smurfette Gets Kidnapped!

Neil Patrick Harris, Christina Ricci, Hank Azaria, Jayma Mays, John Oliver and George Lopez also join Perry for the sequel which hits theaters July 31, 2013.

Click the video above for interviews with the cast!