Sunday was a big night for Chrissy Teigen and John Legend fans, and not just because they got to see the power couple at the 2018 Grammy Awards. After the event, Teigen confirmed the sex of their second child in an Instagram post.

Sharing a photo of herself on the red carpet with her baby bump on display, Teigen wrote, "Mama and her baby boy." The comment immediately sparked a wave of congratulations from fans happy to hear that the "Lip Sync Battle" co-host and her Grammy winner husband are adding a boy to their family, which already includes daughter Luna Simone, who turns 2 years old in April.

mama and her baby boy

A post shared by chrissy teigen (@chrissyteigen) on

Now, for Teigen and Legend, the baby's sex was not a surprise. The two used in vitro fertilization to conceive both of their children, as People reports. Knowing the genetic makeup of their last remaining embryo, Teigen had already tweeted a year ago -- before she was pregnant again -- that their next child would be a boy.

Surprised or not, though, fans are happy for the growing family. We look forward to seeing their little boy in the coming months.