Legend previously told People that he and Teigen were "excited" to welcome their second child but joked that their daughter Luna, who turns 2 in April, might "have some moments where she regrets" having a little brother.
Congrats John and Chrissy - we can't wait to see the first pictures of your lil man!
The couple are already parents to two-year-old daughter Luna.
Before adding: "Wanna hold my boy let's do thisssssss'".
The mum took to Twitter and wrote, "Somebody's here!"
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Explaining why she had reached her final tether, Chrissy said that things were more frustrating because she had known about her pregnancy for so long.
Last month (Apr18), Chrissy's close friend Kim Kardashian threw her a lavish baby shower in Los Angeles, with guests treated to Shake Shack burgers and milkshakes as well as five huge cakes.
John said: "Luna's gonna be an issue".
Chrissy and John started dating in 2007 and married in 2013.
Chrissy and John met on the set of his Stereo music video in 2008 and dated for four years before he proposed in 2011.
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