ET caught up with the designer himself, who exclusively dished on the 38-year-old Magic Mike star's reaction to Vergara in his curve-hugging creation.
"Joe did not come in with her [to the fitting], I think he was out doing his own shopping, but Sofia just wanted to make sure that she felt that he would just love it when he saw it on her," Zunino shared. "Somebody messaged me from the wedding when she had put it on, and said that his eyes just fell out of his head [when he saw her]. He thought she looked so sexy."
Zunino shared exclusive pictures of Vergara's fitting, and it's safe to the 43-year-old Modern Family star was absolutely stunning.
And check out a close-up view of the intricate beading on the blush pink creation.
"We had four women working three weeks on it," Zunino revealed about the labor involved for the dress to come together. "There were a lot of hours in the dress. We started with the beaders that were hand-beading the lace. We had the women that were sculpting the corset to her body, then we had women who were cutting all the layers of the skirt, and it's cut biased so you have to let it hang and stretch and do all of these things. So it was quite a process to make this all happen."
Although it's safe to say the dress turned out perfect, Zunino shared that Vergara was actually hesitant about the dress looking "too young."
"The piece that she loved the most was the piece that at first she was not so sure about -- the big tulled layered organza skirt," he revealed. "We had about 14 layers and there was over 60 yards of fabric in the skirt, and it was very full and very bouncy and she loved it. She loved playing with it."
"But she was also concerned that it looked a little young," he admitted. "She said, 'This is not a silhouette that I normally wear.'"
"Sometimes you read in the press like, 'Oh, Sofía is wearing again the same shape dress,' and I want to answer them and say, 'What the f**k do you want me to wear?'" she told Vanity Fair in April. "Obviously there's a reason why that's what I go for."
"My whole life, buying a bra was a nightmare," Vergara added. "What I used to do when I moved to L.A., I found places like Frederick's of Hollywood that make bras for [strippers]. Believe me, I wish I had fake boobs."
But according to Zunino, she was as far from a bridezilla as you can get, despite knowing exactly what she wanted.
"Sofia didn't seem nervous," he recalled. "And I think the big difference was that she's just fun. She really just left caution to the wind. She's not one of those brides that worry about everything. She just knew she wanted to have fun, and I just think everything just fell in place because of it."
See photos of the couple:
Sofia Vergara, Joe Manganiello, wire/event pics
EXCLUSIVE: Joe Manganiello's 'eyes just fell out of his head' when he saw Sofia Vergara's gorgeous reception dress
Joe Manganiello and Sofia Vergara arrive at the Los Angeles premiere of "Magic Mike XXL" at the TCL Chinese Theatre on Thursday, June 25, 2015. (Photo by Paul A. Hebert/Invision/AP)
HOLLYWOOD, CA - MAY 07: Joe Manganiello and Sofia Vergara Honored With Star On The Hollywood Walk Of Fame on May 7, 2015 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CA - JUNE 09: Actors Sofia Vergara (R) and Joe Manganiello attend the Universal Pictures' 'Jurassic World' premiere at the Dolby Theatre on June 9, 2015 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
Joe Manganiello, left, and Sofia Vergara arrive at the Los Angeles premiere of "Jurassic World" at the Dolby Theatre on Tuesday, June 9, 2015. (Photo by Matt Sayles/Invision/AP)
Sofia Vergara, left, and Joe Manganiello arrive at The Metropolitan Museum of Art's Costume Institute benefit gala celebrating "China: Through the Looking Glass" on Monday, May 4, 2015, in New York. (Photo by Evan Agostini/Invision/AP)
Sofia Vergara and Joe Manganiello arrive at the LA Premiere Of "Hot Pursuit" held at the TCL Chinese Theatre on Thursday, April 30, 2015, in Los Angeles (Photo by Richard Shotwell/Invision/AP)
EXCLUSIVE - Joe Manganiello and Sofia Vergara seen at Warner Bros: The Big Picture 2015 Presentation at CinemaCon on Tuesday, April 21, 2015, in Las Vegas. (Photo by Eric Charbonneau/Invision for Warner Bros./AP Images)
seen at the Red Carpet Arrivals For The 21st Annual SAG Awards held at the Shrine Auditorium on Sunday, Jan. 25, 2015, in Los Angeles. (Photo by Eric Charbonneau/Invision for People Magazine]/AP Images)
IMAGE DISTRIBUTED FOR PUMA - EXCLUSIVE - Joe Manganiello, left, and Sofia Vergara attend a private event at Hyde Lounge during the Justin Timberlake concert hosted by PUMA celebrating the brand's new Forever Faster campaign on Tuesday, Aug. 12, 2014, in Los Angeles. (Photo by John Shearer/Invision for PUMA/AP Images)
NEW YORK, NY - MAY 04: Sofia Vergara and Joe Manganiello attend the 'China: Through The Looking Glass' Costume Institute Benefit Gala at the Metropolitan Museum of Art on May 4, 2015 in New York City. (Photo by Andrew H. Walker/Getty Images for Variety)
HOLLYWOOD, CA - APRIL 30: Actress Sofia Vergara (L) and actor Joe Manganiello attend the Premiere of New Line Cinema And Metro-Goldwyn-Mayer's 'Hot Pursuit' at TCL Chinese Theatre on April 30, 2015 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
NEW YORK, NY - MAY 04: Actress Sofia Vergara (L) and Joe Manganiello attend the 'China: Through The Looking Glass' Costume Institute Benefit Gala After Party on May 4, 2015 at The Standard Hotel in New York City. (Photo by Mark Sagliocco/Getty Images)
LAS VEGAS, NV - APRIL 21: Actors Joe Manganiello (L) and Sofia Vergara attend Warner Bros. Pictures Invites You to ÂThe Big PictureÂ, an Exclusive Presentation Highlighting the Summer of 2015 and Beyond at The Colosseum at Caesars Palace during CinemaCon, the official convention of the National Association of Theatre Owners, on April 21, 2015 in Las Vegas, Nevada. (Photo by Alberto E. Rodriguez/Getty Images for CinemaCon)
BEVERLY HILLS, CA - FEBRUARY 22: Actors Joe Manganiello (L) and Sofia Vergara attend the 2015 Vanity Fair Oscar Party hosted by Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 22, 2015 in Beverly Hills, California. (Photo by Pascal Le Segretain/Getty Images)
LOS ANGELES, CA - JANUARY 25: Actors Sofia Vergara (L) and Joe Manganiello attends the 21st Annual Screen Actors Guild Awards at The Shrine Auditorium on January 25, 2015 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)
Actors Joe Manganiello and SofiÂa Vergara arrive at The Tom Ford Autumn/Winter 2015 Women's Wear Collection Presentation in Los Angeles, California, February 20th, 2015. AFP PHOTO / Valerie Macon (Photo credit should read VALERIE MACON/AFP/Getty Images)
LOS ANGELES, CA - DECEMBER 04: Joe Manganiello and Sofia Vergara attend Gucci And GQ Celebrate Men Of The Year at Chateau Marmont on December 4, 2014 in Los Angeles, California. (Photo by Charley Gallay/Getty Images for GQ)
Joe Manganiello, left, and Sofia Vergara arrive at the 22nd annual Screen Actors Guild Awards at the Shrine Auditorium & Expo Hall on Saturday, Jan. 30, 2016, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
Sofia Vergara, left, and Joe Manganiello attend the LA Special Screening of "Tumbledown" held at Aero Theater on Monday, Feb. 1, 2016, in Santa Monica, Calif. (Photo by John Salangsang/Invision/AP)
Sofia Vergara, left, and Joe Manganiello arrive at the world premiere of "Star Wars: The Force Awakens" at the TCL Chinese Theatre on Monday, Dec. 14, 2015, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)
EXCLUSIVE - Joe Manganiello, left, and Sofia Vergara attend the 67th Primetime Emmy Awards on Sunday, Sept. 20, 2015, at the Microsoft Theater in Los Angeles. (Photo by Alex Berliner/Invision for the Television Academy/AP Images)
Sofia Vergara, left, and Joe Manganiello arrive at the 67th Primetime Emmy Awards on Sunday, Sept. 20, 2015, at the Microsoft Theater in Los Angeles. (Photo by Danny Moloshok/Invision for the Television Academy/AP Images)