Legend and Teigen having boy

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Chrissy Teigen and John Legend

John Legend and Chrissy Teigen are adding a son to their family, the pregnant model has revealed.

The 32-year-old shared the news on her Instagram page as she and her singer husband made it an early night after attending the Grammy Awards in New York on Sunday.

Posting a picture of herself from the Grammys red carpet, which showed her with her hand tenderly placed on her growing bump, Chrissy captioned it: "Mama and her baby boy."

The gender reveal comes after Chrissy said in an interview earlier this month that she and John had found out what they were having, but had decided to keep in a secret for the time being.

Chrissy looked stunning in a glittering silver gown with a thigh-high split for the star-studded awards ceremony at Madison Square Garden, New York, while John looked smart in his navy blue tuxedo.

It was the second consecutive night out for the parents-to-be, who had attended the Clive Davis Pre-Grammy Gala on Saturday night. As the pair spoke to media outlets on the red carpet, they remained tight-lipped about the tot's gender, but Chrissy told Entertainment Tonight that her second child will take after John more than the couple's 21-month-old daughter Luna.

"I hope baby two is like John a lot," she smiled. "Baby Luna's more like me" and I realized I can be difficult."

However, All Of Me singer John will be happy with whoever their new baby takes after.

"I'm very much in love with my wife and my daughter so if the next baby has any of their characteristics I'll be very happy," he added.