Chrissy Teigen and John Legend plan to have a baby boy in 2018.

Chrissy Teigen and John Legend

Chrissy Teigen and John Legend

The 31-year-old model and her award-winning husband already share a nine-month-old daughter called Luna and after Chrissy recently confirmed she wanted to have a boy, the curvaceous star has taken to Twitter to reveal she will have her second child through IVF treatment.

She said: "Since this is coming up again, I said our next baby would be a boy because that is the embryo we have left. A boy. So. Yeah.

"And no, I am not pregnant. (sic)"

Chrissy also hit out at Twitter trolls who criticised her for not trying to get pregnant "naturally".

She snapped back at one social media user: "Hi Linda, thanks for asking, you complete witch. I tried for about 9 years. Anything else, let me know! (sic)"

Chrissy has confirmed she would like to become pregnant again towards the end of 2017, revealing her husband is also eager for them to have another child.

She told 'Extra': "When we get to stay at home. [John] goes on tour, I think, all of May, so after that, I guess. He's literally like, 'Please unfreeze me.'"

John previously revealed the couple are hoping to have "three or four" children.

He shared: "It's a beautiful thing. We want to have a few more hopefully. Three or four. We'll play it by ear though."

The couple struggled with infertility for several years before turning to IVF in order to conceive, and John revealed they decided to speak to a doctor to try and figure out why it wasn't happening naturally for them.

He explained: "We figured eventually we'd have to go into the doctor and see why it wasn't happening naturally.

"You know, sometimes it's just harder for some people than for others. He's never really told us that there was something specific that he could identify was the reason why it just didn't work out naturally. We did what we had to do."