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Carrie Underwood Talks Marriage on 'Ellen' (Video)

The country singer, who's promoting her new album "Blown Away," says hockey-player husband Mike Fisher is having a hard time adjusting to her vegan diet.

Carrie Underwood Iheartradio performance P
Jennifer Pottheiser for iHeartRadio

Carrie Underwood says her marriage to Mike Fisher is doing fine, except for a few obstacles that have caused the couple to clash.

For one, the country superstar found it difficult to compromise her personal space with Fisher (and all his stuff), she said on Wednesday's edition of The Ellen DeGeneres Show.

"Now we share. We're much better. I'm better. I've got the only child syndrome thing, like I don't share my toys or my space," she told DeGeneres, adding: "We're doing well."

VIDEO: Carrie Underwood Sings 'Alone' at iHeartradio Show

Another problem: her vegan diet.

"I mean, obviously it’s one more…'Let’s make my life more complicated' kind of thing," she said. "But he’s all right.  He’s actually getting better. I’ll offer to make him something I’m making myself and he’ll say 'sure.'"

Underwood and Fisher got married in Greensboro, Ga., in July 2010; he's a Canadian-born pro hockey player who was traded to the Nashville Predators last year.

Underwood, 29, is making the media rounds to promote her latest album, Blown Away, a No.1 download on iTunes. She performed the title single on last Thursday's American Idol -- her former stomping grounds -- as well as the new song, "Good Girl," on Letterman last week.

Watch the clip of her Ellen interview below.