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"We have two babies and some pups and a life I am grateful to have," Teigen wrote in the caption. "My everything, I love you and am so proud of the story we've created."
Here's a look back at their heartwarming love story.
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September 14, 2006: They met on the set of Legend's music video for "Stereo."
"Stereo" was a single released retroactively from Legend's 2006 album "Once Again."
John Legend/YouTube
Over the next year, they remained in touch but didn't define their relationship.
Legend and Teigen in 2007.
Peter Kramer/Mark Mainz/Getty Images
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Around this time, they broke up — for half an hour.
Legend was on tour for the majority of 2007.
Ethan Miller/Getty Images
They also took their first trip to Lake Como, Italy, in 2007 — where they would eventually get married.
Teigen posted this photo on July 17, 2016 in Lake Como, Italy.
@chrissyteigen/Instagram
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February 2008: They made their red carpet debut as a couple.
Legend had won two Grammy Awards the previous year.
Frazer Harrison/Getty Images
December 2011: Legend proposed during a vacation in the Maldives.
Teigen wore her new engagement ring to the the Grammy Awards in February 2012.
Jason Merritt/Getty Images
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June 2013: Legend debuted "All of Me," a love song written about Teigen.
The intimate video featured multiple black-and-white shots of the couple together.
John Legend/YouTube
September 10, 2013: Teigen and Legend got hitched in a quiet courthouse ceremony.
Teigen and Legend sitting front row at the Vera Wang fashion show during New York Fashion Week. Later that day, they got married.
Michael Loccisano/Getty Images
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September 14, 2013: They said their vows in Lake Como, Italy.
Teigen posted this throwback photo on their fifth wedding anniversary.
@chrissyteigen/Instagram
May 2015: Teigen and Legend posed together for the cover of DuJour magazine.
Teigen told DuJour that "John loves pregnant women."
@dujourmedia/Instagram
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October 12, 2015: They announced Teigen's pregnancy.
Teigen and Legend in November 2015.
Mike Windle/Getty Images for A+E Networks
April 14, 2016: Teigen gave birth to the couple's first child, daughter Luna Simone.
Two-year-old Luna.
Jerod Harris/Getty Images for Airbnb
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November 21, 2017: Teigen announced that she was pregnant again with an adorable Instagram video.
Teigen and Legend in December 2017.
Charley Gallay/Getty Images for GQ
January 28, 2018: The couple confirmed that they were expecting a baby boy.
Teigen in her second trimester, pictured in January 2018.
Phillip Faraone/Getty Images
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May 17, 2018: Teigen gave birth to their son, Miles Theodore.
Teigen posted this family photo (sans Legend) in July.
@chrissyteigen/Instagram
September 2018: Teigen posted the sweetest tributes to her husband after he won Hollywood's most coveted award.
Legend, 39, is also the youngest person to achieve this honor.
Alberto E. Rodriguez/Getty Images
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October 2019: The whole family was featured on the cover of Vanity Fair.
The cover photo was shot by Mark Seliger.
Vanity Fair
August 13, 2020: The couple revealed they're expecting their third child.
Teigen and Legend in the "Wild" music video.
John Legend/YouTube