Teigen, 36, made the announcement on Instagram that she is pregnant after undergoing in vitro fertilization, People reported.
She posted photos of her baby bump while wearing a cropped black T-shirt and lace underwear.
“The last few years have been a blur of emotions to say the least, but joy has filled our home and hearts again,” Teigen wrote. “1 billion shots later (in the leg lately, as u can see!) we have another on the way.”
Legend and Teigen are parents to 5-year-old Luna and 3-year-old Miles, according to Billboard.
Teigen admitted that she had fears about the pregnancy after the loss of her third child, who she called Jack, in September 2020.
“Every appointment I’ve said to myself, ‘OK if it’s healthy today I’ll announce’ but then I breathe a sigh of relief to hear a heartbeat and decide I’m just too nervous still,” Teigen said, according to People. “I don’t think I’ll ever walk out of an appointment with more excitement than nerves but so far, everything is perfect and beautiful and I’m feeling hopeful and amazing. OK, phew, it’s been very hard keeping this in for so long!”
The gender of the baby is unclear, but many of her fans flooded her Instagram comments section with warm wishes and congratulatory messages, according to “Good Morning America.”
“We’re waiting for that little bebé with open arms,” fellow “Cravings” co-author Adeena Sussman wrote.
Photos: Chrissy Teigen through the years Here are some memorable photos of Chrissy Teigen through the years. (David Livingston/Getty Images)
Photos: Chrissy Teigen through the years 2007: Model Christine Teigen is touched up at the TRESemme station backstage at "Movies Rock" A Celebration of Music in Film held at the Kodak Theatre on December 2, 2007, in Hollywood, California. (Mark Mainz/Getty Images for Conde Nast Media Group)
Photos: Chrissy Teigen through the years 2008: Singer John Legend (left) and Christine Teigen arrive at the 50th annual Grammy awards held at the Staples Center on February 10, 2008, in Los Angeles. (Frazer Harrison/Getty Images)
Photos: Chrissy Teigen through the years 2009: Musician John Legend and Chrissy Teigen arrive at the 81st annual Academy Awards held at Kodak Theatre on February 22, 2009, in Los Angeles. (Frazer Harrison/Getty Images)
Photos: Chrissy Teigen through the years 2010: Model Christine Teigen (left) and Musician John Legend arrive at the 2010 CNN Heroes: An All-Star Tribute held at the Shrine Auditorium on November 20, 2010, in Los Angeles. (Frazer Harrison/Getty Images)
Photos: Chrissy Teigen through the years 2011: Model Christine Teigen attends the SI Swimsuit Launch Party hosted By Pranna at Pranna Restaurant on February 15, 2011, in New York City. (Michael Loccisano/Getty Images for Sports Illustrated)
Photos: Chrissy Teigen through the years 2012: Model Chrissy Teigen kisses MLB Legend Steve Garvey during the 2012 Taco Bell All-Star Legends & Celebrity Softball Game at Kauffman Stadium on July 8, 2012, in Kansas City, Missouri. (Rick Diamond/Getty Images)
Photos: Chrissy Teigen through the years 2013: John Legend and Chrissy Teigen attend the Time/CNN/People/Fortune Pre-Dinner Cocktail Reception at Washington Hilton on April 27, 2013, in Washington, D.C. (Larry Busacca/Getty Images for Time Inc.)
Photos: Chrissy Teigen through the years 2014: Chrissy Teigen (left) and John Legend attend the "Charles James: Beyond Fashion" Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014, in New York City. (Larry Busacca/Getty Images)
Photos: Chrissy Teigen through the years 2015: Model Chrissy Teigen attends the 87th annual Academy Awards at Hollywood & Highland Center on February 22, 2015, in Hollywood, California. (Jason Merritt/Getty Images)
Photos: Chrissy Teigen through the years 2016: Model Chrissy Teigen (left) and recording artist John Legend attend the 88th annual Academy Awards at Hollywood & Highland Center on February 28, 2016, in Hollywood, California. (Kevork Djansezian/Getty Images)
Photos: Chrissy Teigen through the years 2017: Model Chrissy Teigen (left) and singer John Legend attend the 89th annual Academy Awards at Hollywood & Highland Center on February 26, 2017, in Hollywood, California. (Frazer Harrison/Getty Images)
Photos: Chrissy Teigen through the years 2018: Model Chrissy Teigen (left) and recording artist John Legend attend the 60th annual Grammy Awards at Madison Square Garden on January 28, 2018, in New York City. (Christopher Polk/Getty Images for NARAS)
Photos: Chrissy Teigen through the years 2019: Chrissy Teigen (left) and John Legend attend the 2019 Vanity Fair Oscar Party hosted by Radhika Jones at Wallis Annenberg Center for the Performing Arts on February 24, 2019, in Beverly Hills, California. (Dia Dipasupil/Getty Images)
Photos: Chrissy Teigen through the years 2020: Chrissy Teigen attends the 62nd annual Grammy Awards at Staples Center on January 26, 2020, in Los Angeles. (Frazer Harrison/Getty Images for the Recording Academy)
Photos: Chrissy Teigen through the years 2021: In this image released on May 2, Chrissy Teigen attends Global Citizen VAX LIVE: The Concert to Reunite the World at SoFi Stadium in Inglewood, California. (Emma McIntyre/Getty Images for Global Citizen VAX LIVE)