The 39-year-old presenter and her footballer husband announced they were expecting their first child together last week.
Appearing on today's Lorraine, Christine showed off her burgeoning belly in a brightly coloured floral dress.
Chatting to host Lorraine Kelly, she said: "There is a little bump there, in the morning it's not too bad but as the day progresses I just gradually get bigger and bigger.
"The second I start to eat it just goes [sticks her hands out in front of her].
"So this is the good stage, it's contained then it just gets bigger as the day goes on."
She also revealed how Frank's two daughters cannot wait to meet their new sibling, and that they're desperate for a little sister.
Christine said: "We're all excited, you get to the stage where you don't think about it and you think maybe it won't happen.
"Frank's girls are completely beside themselves, more excited than I thought they would be.
"They are constantly talking to the belly. They are wanting to be the first name that it says.
"It's a lovely little relationship with the bump there.
"It does have to be a girl though, apparently, that's the only issue. I can't guarantee that! They're desperate for a little girl," she joked.
"We are all in this together now… we feel very grateful."
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