updated 03/23/2012 AT 8:00 AM ET
•originally published 03/23/2012 AT 10:00 AM ET
Julia Roberts plays the Evil Queen in the new Snow White film Mirror, Mirror, but it turns out the Oscar winner has some tricks up her sleeve even in her own house – especially when it comes to her kids.
Roberts, 44, says she gets a huge kick out of scaring her children – Henry, 4, and 7-year-old twins, Hazel and Phinnaeus.
“If I hear them coming and they don’t know where I am in the house, I crouch down in their private space and [when] they come in, I jump out,” she tells Ellen DeGeneres on Friday’s The Ellen DeGeneres Show. “Really, little people can just catch air. They just vault.”