Vanessa and Nick Lachey Reveal They're Having a Baby Boy in Adorable Instagram Video -- Watch!

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It's be a boy for Nick and Vanessa Lachey, and they couldn't be more grateful.

Vanessa took to Instagram on Thursday to share the sweet news with fans in an adorable video showing how she revealed the gender of baby No. 3 to Nick earlier this year.

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"I have so much to be Thankful for this year... especially our littlest Lachey," she wrote alongside the cute video. "When Daddy came home from tour this Summer and we were moving into our new house I shared the news!?? Now I'm sharing it with you!"

"I am so very Thankful and Grateful for this family of mine! And Thankful for YOU! All your Love & support makes what we do FUN and worth it! Happy Thanksgiving Everyone!" she concluded. "Love, V ?."

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"Best surprise ever!" Nick captioned the s ame video on his own Instagram.

It seems the cute couple has been able to keep their baby's gender a secret for a while now, though they couldn't have been happier to share the news that they were expecting in September.

"We got a new crib, now we need a new CRIB!" Vanessa wrote in a clever Instagram post, also revealing that they were moving to a new house.

WATCH: Nick and Vanessa Lachey Take Their Kids to Disneyland

See more in the video below.