The former Bachelorette star and her husband, Kevin Manno, welcomed their second child, a baby boy, on Thursday, Fedotowsky announced on Instagram.
"Our sweet boy has arrived! Born 5/24, 12:57am at 21.5 inches and weighing 8lbs 11oz," Fedotowsky wrote. "We are so grateful and bursting with love!"
Ahead of the baby's arrival, Fedotowsky took to Instagram on Tuesday to let her fans know she was a day away from welcoming the newest member to her family.
"This is so surreal to say but tomorrow we meet our son," she captioned an adorable family pic, featuring her husband, their dog, Owen, and 1-year-old daughter, Molly. "Molly and Owen are crying tears of joy 😂 Today is all about family and enjoying our last moments as a family of 3 (plus poochie!) before our world is changed once again forever ❤️"
She also dedicated a separate post to her "sweet girl" Molly, whom she says "changed me forever."
"As our days with her as our only baby come to an end, it took everything in me to fight back the tears so I could see enough to type out an open letter to her," Fedotowsky shared.
Back in January, ET spoke with Fedotowsky and Manno on the red carpet at the Hallmark TCAs, where they opened up about how Molly was feeling about becoming a big sister.
"We told her with books," Manno revealed. "When Ali told me [she was pregnant], she told Molly, and she had these books and stuff, like, 'I'm gonna be a big sister,' and that's how she told me. We got her a little baby, too. To, like, carry around and give milk to, but she doesn't."
"She doesn't get it," Fedotowsky added. "There's a baby in Mommy's belly and, you know, sometimes she'll say, 'baby,' and she'll point [at my belly], but she doesn't understand it. I don't even know if she'll get it when the baby actually comes, but hopefully... it's not going anywhere, so!"
At the time, Fedotowsky also revealed her original due date.
"May 30, to be exact, but the doctors are already saying we think it's going to be a little bit earlier than that," she said. "This time, we're just having a really hard time [picking out a name]. It might be one of those situations where we have the baby and we're tweeting, 'What do we name this baby? Help us!'"
Ali Fedotowsky out and about
Ali Fedotowsky out and about
LOS ANGELES, CA - APRIL 06: Ali Fedotowsky is seen on April 6, 2017 in Los Angeles, CA. (Photo by GP/Star Max/GC Images)
HOLLYWOOD, CA - MARCH 13: TV personality Ali Fedotowsky-Manno visits Hollywood Today Live at W Hollywood on March 13, 2017 in Hollywood, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - DECEMBER 17: Kevin Manno and Ali Fedotowsky attend 'Dance For Kids Holiday Party' presented by Children's Miracle Network Hospitals at Avalon Hollywood on December 17, 2016 in Los Angeles, California. (Photo by Loreen Sarkis/Getty Images)
CULVER CITY, CA - SEPTEMBER 24: TV personality Ali Fedotowsky (R) and daughter Molly Manno attend the Step2 & Favored.by Present The 5th Annual Red Carpet Safety Awareness Event at Sony Pictures Studios on September 24, 2016 in Culver City, California. (Photo by Tara Ziemba/Getty Images)
CULVER CITY, CA - SEPTEMBER 24: TV personality Ali Fedotowsky and daughter Molly Manno pose with members of the U.S. Army National Guard National Guard at the Step2 & Favored.by Present The 5th Annual Red Carpet Safety Awareness Event at Sony Pictures Studios on September 24, 2016 in Culver City, California. (Photo by Alberto E. Rodriguez/Getty Images for Favored.by)
BEVERLY HILLS, CA - JUNE 12: Ali Fedotowsky and Kevin Manno attend the Children Mending Hearts and Vintage Grocers Presents the 8th Annual 'Empathy Rocks' event on June 12, 2016 in Beverly Hills, California. (Photo by Jesse Grant/Getty Images)
BEVERLY HILLS, CA - MAY 20: Ali Fedotowsky attends Step Up's 13th Annual Inspiration Awards at The Beverly Hilton Hotel on May 20, 2016 in Beverly Hills, California. (Photo by Matt Winkelmeyer/Getty Images)
WEST HOLLYWOOD, California - MARCH 24: Kevin Manno and Ali Fedotowsky attend the partnership celebration between TOMS and Oceana to help save the sea turtles on March 24, 2016 at Au Fudge in West Hollywood, California. (Photo by Randy Shropshire/Getty Images for Oceana)
THE BACHELORETTE - Successful and stunning real estate developer JoJo Fletcher, 25, gets a second chance at her happily-ever-after, choosing from twenty-six handsome bachelors. After being devastated last season by a shocking rejection from Bachelor Ben Higgins, who confessed his love to both her and Lauren Bushnell, the Texan beauty is ready to leave that heartbreak behind and write her very own love story as the Bachelorette. JoJo will embark on her own journey to find her soul mate when she stars in the 12th edition of ABC's hit romance reality series, 'The Bachelorette,' which will premiere at a special time MONDAY, MAY 23 (9:01-11:00 p.m. EDT), on the ABC Television Network. (Photo by Rick Rowell/ABC via Getty Images)
KAITLYN BRISTOWE, ALI FEDOTOWSKY, JOJO FLETCHER, DESIREE SIEGFRIED
LOS ANGELES, CA - FEBRUARY 14: Kevin Manno;Ali Fedotowsky attend the Colgate Optic White Beauty Bar ï¿½Day 2 at Hudson Loft on February 14, 2016 in Los Angeles, California. (Photo by Araya Diaz/Getty Images for BMF Media)
THE BACHELOR AT 20: A CELEBRATION OF LOVE - Romance is definitely in the air as we take a look back at 20 seasons of 'The Bachelor' and the fantasy of love - as well as the rollercoaster ride of falling in love. Viewers will catch up with some of their favorite Bachelors and Bachelor couples of all time and discover how these love stories have continued long after their final rose ceremonies. Then, Bachelor Nation is invited to another wedding, as Jade Roper and Tanner Tolbert, the newest sweethearts, tie the knot, when Chris Harrison hosts the two-hour special, 'The Bachelor At 20: A Celebration of Love,' airing SUNDAY, FEBRUARY 14, 8:00-10:00 p.m., ET), on the ABC Television Network. (Photo by Matt Petit/ABC via Getty Images)
ALI FEDOTOWSKY, KEVIN MANNO
LOS ANGELES, CA - DECEMBER 05: (EXCLUSIVE COVERAGE) Television personality Ali Fedotowsky attends at 2015 Santa's Secret Workshop Benefiting L.A. Family Housing at Andaz Hotel on December 5, 2015 in Los Angeles, California. (Photo by Tiffany Rose/Getty Images for Santa's Secret Workshop 2015)
SANTA MONICA, CA - JANUARY 09: Television personality Ali Fedotowsky arrives at the 2016 World Dog Awards at Barker Hangar on January 9, 2016 in Santa Monica, California. (Photo by Amanda Edwards/WireImage)
NEW YORK, NY - DECEMBER 03: Kevin Manno (L) and Ali Fedotowsky appear as Ali Fedotowsky hosts the Curve Fragrances For Men TriviaNYC game night at Tortilla Flats, NYC on December 3, 2015 in New York City. (Photo by Brian Ach/Getty Images for Curve Fragrances)
LOS ANGELES, CA - DECEMBER 02: Ali Fedotowsky (R) and Kevin Manno are seen at LAX on December 02, 2015 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
LOS ANGELES, CA - SEPTEMBER 19: Ali Fedotowsky attends the 4th annual Red CARpet Safety Awareness event presented by Favored By at Skirball Cultural Center on September 19, 2015 in Los Angeles, California. (Photo by Leon Bennett/WireImage)
BEVERLY HILLS, CA - AUGUST 21: Ali Fedotowsky (R) and Kevin Manno arrive at The Beverly Hilton celebrates 60 Years with a Diamond Anniversary Party held on August 21, 2015 in Beverly Hills, California. (Photo by Michael Tran/FilmMagic)
LOS ANGELES, CA - JUNE 10: Ali Fedotowsky arrives at the Los Angeles premiere of Abramorama's 'Live From New York!' held at Landmark Theatre on June 10, 2015 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)
LOS ANGELES, CA - JUNE 10: Ali Fedotowsky and Kevin Manno attend the 'Live From New York!' Los Angeles premiere at Landmark Theatre on June 10, 2015 in Los Angeles, California. (Photo by Stefanie Keenan/Getty Images for JGL Inc.)
LOS ANGELES, CA - MARCH 26: TV personality Ali Fedotowsky arrives at the World Premiere of EPIX's 'Katy Perry: The Prismatic World Tour' at The Ace Hotel Theater on March 26, 2015 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)