Kelly Clarkson has told how she's been suffering from morning sickness,

The singer, 31, announced last week that she was expecting her first child and told US show Today that her and her husband had picked a name for the baby before even finding out she was pregnant.

She told US show Today: "I don't know why they call it morning sickness. It's all day and all night... I'm just looking forward to the second trimester. They say it's better!"

The American Idol star said that she and husband Brandon Blackstock were forced to make the pregnancy announcement earlier than planned after Kelly had to cancel a performance due to morning sickness.

"I had to cancel something because I'd been so ill, so I didn't want people to think I was cancelling (because) I'm lazy or something, so we just told people," she said

Kelly said that she had a "gut feeling" she would be having a girl, joking: "She's killing me. Of course it's a girl, causing the trouble."

The star said of her relationship with music manager Brandon, who she married last month: "Our job is so not normal, we're on the go all time, it's hard to date.

"What's great about Brandon is he's a manager so he totally gets what I do. He can do his job from the road so he can be out with me sometimes."