Credit: Michael Rozman/Warner Bros.

Carrie Underwood and Mike Fisher have set a wedding date!

Sadly, though, it's "not one that we're openly talking about," she says on The Ellen DeGeneres Show Wednesday. (Us Weekly has reported the two will tie the knot sometime this summer.)

As their date approaches, she says they've been "so laid back."

They picked out "food and we know where we're going to be -- the big hurdles."

Everything else? "We don't care," she says.

"Everybody would always ask me questions like, 'What have you always dreamt of? This is your day,'" says Underwood, 27. "I never thought about it until I was engaged. I wasn't one of those little girls that always dreamed about getting married. So I have no idea what I'm doing, basically!"

She is certain about one thing: "We're trying to keep it as small as possible," she says.

But it'll be tough.

Says the singer, "He has so many family members and all my friends are people that I work with and I love to death, so...."