Carrie Underwood's husband Mike Fisher is ''doting'' on her during her pregnancy.

The 'Before He Cheats' hitmaker and the 38-year-old former NHL player - who already have three-year-old son Isaiah together - are set to expand their brood as Carrie is expecting the pair's second child, and Mike has reportedly been ''the most amazing husband'' to her during her pregnancy.

A source said: ''Mike is being the most doting, amazing husband while Carrie pregnant. Mike tries to take Carrie out once or twice a week for date night in Nashville.''

Despite already having one child, the sporting star is even brushing up on his technique by reading parenting books, and doing his best to make sure the 35-year-old singer is ''happy and comfortable''.

The insider added to Us Weekly magazine: ''[He is] reading a bunch of parenting books, rubbing Carrie's feet and is making sure she is happy and comfortable at all times.''

Meanwhile, the 'Cry Pretty' singer recently said she's doing her best to plan ahead before the new arrival comes, because she knows being a mother of two is going to be a ''different ball game''.

She said: ''It's going to be a different ball game, for sure. My brain, I'm such a planner. I want to know how it's all going to go. But no matter who you are, you make it happen, you make it work, you get your team behind you.''

Carrie is hoping that all hands will be on deck to help around the house once the tot is born, and she's confident Isaiah will be a ''really good big brother'' to his new sibling.

She added: ''I think he'll be a really good big brother. I think he'll be helpful.''

Previously, sources claimed Carrie couldn't be happier to be pregnant again, as it comes after a tough year which saw her suffer a serious accident for which she had to undergo surgery for a broken wrist and receive more then 40 stitches on her face.

The insider said: ''This baby is incredibly exciting because it represents new beginnings after a very challenging year. She is ready to put her accident behind her and focus on her family and her new album release.

''Mike is thrilled because he desperately wanted another baby, and their son Isaiah even talks about a baby brother or sister, so the whole family is in celebration mode. When Mike and Carrie married he told her he wanted a large family, so this is a dream come true for him.''