The child will be Teigen and Legend's second, and could possibly be a boy, according to Entertainment Tonight.
The couple, who already have one-year old daughter Luna, broke the big news on Instagram.
Showing off her sense of humour, Chrissy poked fun at a parternity row, captioning the video: "It's John's".
Adding to the fun, Legend made reference to the U.S. version of Jeremy Kyle, writing: "Maury will have the final word on this".
"That's my dream, I want to just be pregnant kind of for the rest of my life", she said. 'Not for the rest of my life, but the rest of my fertile life.
Test'Just got banged... it really is her hair' her stylist Jen Atkin proudly declared in a mini clip tugging on it to prove
Both Chrissy and John have been open about the fact that they struggled to conceive in the past, finally having Luna after several rounds of IVF treatment.
Now, with this information only being announced this morning, you would have probably thought, like us, that Chrissy was in the early stages of her pregnancy and that there wasn't a baby bump yet. "A boy. So. Yeah". Luna is seen sitting on her lap as Chrissy asks: "Luna!" Though, like the rebel we know she is, the 31-year-old model went against the masses and chopped her hair into bangs anyways.
Well, it might have been because Teigen was doing some particularly adept bump-hiding on her Instagram up until now.
She wrote: "When I wasn't in the [Lip Sync Battle] studio, I never left the house".
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