And now Chrissy has treated us to a first look at the little one - and just *look* at how adorable he is.
Chrissy also revealed her second child's name... Miles Theodore Stephens. What a great moniker!
Taking to Instagram to share baby's first picture, she wrote: "Hello, world! This is Miles Theodore Stephens - We are drowning in his little peeps and nuzzles. Our household feels overwhelmed with love. Thank you for all your well wishes!"
We can't wait to see more updates.
The model took to Twitter to share the happy news that she'd welcomed Miles last week, writing: "Somebody's here!", followed by baby and milk bottle emojis.
Chrissy must be delighted to have finally given birth after she admitted she was 'over' being pregnant.
She took to Twitter to say: "Happy pregnant Chrissy is gone. meet OVER IT Chrissy. Wanna hold my boy let's do thisssssss ... It feels worse for me because with IVF you know *so* early. I mean I knew I was pregnant at 11 days in. Crazy. (sic)"
We found out the little family was expanding in 2017, after they announced that they were expecting their second child.
They revealed the news with the cutest Instagram video of Chrissy asking their one-year-old daughter: "Luna, what's in here?" Luna then points to her mum's stomach and says, "baby!" And now we are living for every detail.
In classic Chrissy style (check out her funniest tweets for proof of her hilarity), she's shared a laugh-out-loud tweet about her pregnancy weight gain.
“Up 40 pounds and not one ounce went to my butt,” the Lip Sync Battle host tweeted. “Please stop shaming the buttless, we are trying.”
Chrissy constantly seemed on a quest for a bigger behind, after revealing in an interview with Esquire back in 2014: “I didn’t know butts were a thing until I was twenty-three. Then came Jennifer Lopez and people were like, ‘That butt is great.’ Now you have to have a butt. It sucks for me."
“I have a little half-Asian butt, and the more I work out, the more I try to get it bigger, it’s just going to get flatter and harder.”
And this is why we love her.
We found out back in January that Chrissy and John were expecting a little boy.
Surrounded by the glitz and glamour of the GRAMMYs, Chrissy took to Instagram to reveal that they are having a little boy, and fans rushed to congratulate them.
The couple have been open about their struggle to conceive and have spoken candidly about IVF treatment.
"A lot of stuff's about to come," said Chrissy. "We're going to try to have a child. This is for us to try to get in the zone of 'let's travel, let's be away together, let's see our closest friends,' and then we're going to have to do something super hard, which is the IVF process, all over again."
Speaking of the fertility treatment, John added: "I wouldn't say we can't conceive naturally, but I would say that it's enough of a challenge where it felt like we needed help. We're lucky that we're living in an age where we can conceive in other ways. [IVF] brought us Luna and hopefully it will bring us a few more awesome kids, too."