06/04/2007 AT 07:30 AM EDT
When it comes to dirty diapers, new dad Jon Heder says bring 'em on.
"I think I was basically prepared for everything," Heder, 29, told PEOPLE at the Surf's Up
premiere in Westwood, Calif., on Saturday when asked if fatherhood had offered any surprises.
"I didn't realize changing diapers was going to be as fun. That was actually the thing I was most apprehensive about, but now it's like, 'Let's change a diaper! I hope she's made a doodoo, so I can just change it.' "
The Napoleon Dynamite
star and his wife, Kirsten, welcomed their first child
, daughter Evan Jane, in May.
And apparently, Evan Jane enjoys her diaper changes as much as Dad: "She's always awake and happy and playful when she gets a diaper change," Heder said.
In the animated Surf's Up,
Heder voices Chicken Joe, a surf buddy to penguin Cody Maverick (Shia LaBeouf).