A source close to the family tells ET that Teigen is pregnant with a boy, and that she and Legend are thrilled to be welcoming another child.
"Chrissy and John are so excited to be having another baby -- and Luna is too!" the source said, adding that it hasn't been easy with Teigen's past struggles with infertility and postpartum depression. "She loves touching Chrissy's belly and 'talking' to the baby."
"It’s perfect that they’re sharing the news over Thanksgiving, because they are incredibly grateful to be adding to their family!" the source continued.
Teigen teased that she and Legend were trying for a second baby during an interview with InStyle in October. She told the magazine that in the "coming months," she would be implanted with a frozen embryo and attempt to have a second child using IVF.
The brunette beauty continued on, explaining that when she began the fertility treatment the first time around with Luna, they started with about 20 embryos. After checking for imperfections and narrowing them down to the ones that "you know are going to be good for your body," they were left with three.
"The first little girl didn't work, and then the second is Luna," she recalled.
When ET caught up with Teigen at the 28th Annual Producers Guild Awards in January, she also expressed her interest in having a second child.
"Oh my god, a little boy is next for sure," she exclaimed.
And although Luna can't speak for herself just yet, we have a feeling she's going to be an awesome big sis! See some of her cutest Instagram moments below: