The happy news emerges weeks after Teigen told InStyle magazine's November issue that she and John were planning to spend the holidays trying for another baby.
The footage is of her baby girl Luna Legend pointing to her tummy, with the mum asking, "Luna, what's in here?" before exclaiming, "Baby!"
Her Grammy-winning spouse made sure to chime in as he playfully commented underneath "Maury will have the final word on this" referring to TV host Maury Povich who is famed for his "You are NOT the father" catchphrase.
In the (adorable) post, the couple's daughter, Luna, can be seen patting Teigen's stomach.
The two welcomed their daughter Luna in 2016 via IVF.
Signet Jewelers Ltd. Stock Gets Slammed on Weak Outlook
The value of the investment in Signet Jewelers Ltd went from $38,255,000 to $38,436,000 a change of $181,000 quarter over quarter. The range of a day's trading is high-low, and True Range expands into yesterday's close when it lands outside of today's range.
Lizzy Caplan In Talks To Star In Channing Tatum Starrer 'Gambit'
Caplan will next be seen in James Franco's The Disaster Artist on December 6 alongside Franco, his brother Dave and Alison Brie. The movie will be bankrolled by Fox Entertainment and is slated to release on February 19, 2019.
Splatoon 2 paints new updates for November 23
The second of these free updates will roll out sometime in mid-December and will introduce a new game mode called "Clam Blitz". Collecting 10 clams will net you a Power Clam, which is the key to breaking the barrier and ultimately winning the game.
The 31-year-old revealed she was going to be implanted with a frozen embryo as part of their in vitro fertilisation treatment to expand their family. "Everyone I told first was like 'uh yeah, we knew thanks, '" she captioned. It's everything you could ask for in an announcement: a big sis who can't quite express what's going on since she's merely 17 months old, a very chill mom, and plenty of happiness and hygge all around.
"I think it's especially hard when you can't conceive naturally". But Teigen and husband John Legend have always been open about their struggles to conceive, so this news is just that much sweeter for fans of the superstar couple.
As far as celebrity babies go, Luna Simone Legend is incontestably one of the cutest around. "But I would hate for people to think those days didn't exist".
"We're lucky that we're living in an age where we can conceive in other ways", he continued.