Married at First Sight expert Dr. Pepper Schwartz has revealed the experts' biggest worry when matching couples for any given season of the show.

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Pepper and her fellow Married at First Sight experts Pastor Calvin Roberson and Dr. Viviana Coles matched five Atlanta-based couples -- including Vincent Morales and Briana Miles as well as Ryan Oubre and Clara Fergus -- to wed on the Lifetime reality series' twelfth season.

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During the January 27 episode of Married at First Sight: Unfiltered, Dr. Pepper watched back a Season 12 clip of Vincent and Briana's wedding day.

Vincent said in the clip he'd love to share his wedding pictures with his grandchildren one day, and Briana gushed about feeling "joy" when she kissed her groom.

Briana added the idea of building a future with Vincent made her feel "elated."

Pepper noticeably had tears in her eyes, and she noted, "It's so sweet!"

Unfiltered host Jamie Otis -- who starred on Season 1 of Married at First Sight -- asked Vincent how it felt to watch that footage back.

"Actually, I look pretty good on TV," Vincent said with a big smile, causing everyone on the set to burst into laughter.

"And my wife!" Vincent corrected himself. "And my wife."

Despite giving a great first impression of himself on his wedding day, Vincent admitted he was all over the place.

"I just felt like a trainwreck, and what was playing in my head was not what actually happened. It just seemed like it went great," Vincent gushed. "It was an awesome time."

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Vincent also said "for some reason," kissing his wife simply "felt right."

"It didn't feel forced, so I think it's just, again, the energy and the vibe was there for both of us," Vincent reiterated.

Pepper was then asked to share her thoughts on Vincent and Briana as a match so far.

"Well, I helped put them together, so obviously I'm very supportive!" Pepper said with a laugh.

"I'm so glad that there's the chemistry there. You know, that's the thing we often worry about the most. We try for chemistry but we can't predict it," Pepper explained.

Pepper therefore said she felt "huge relief" when "that part of the foundation" was there for both Vincent and Briana as well as Ryan and Clara.

Given the experts spent months matching the Married at First Sight couples for Season 12, Jamie asked Pepper how it felt to watch the five couples finally come together and tie the knot.

"It's a mixture of relief and pride and excitement. We're very invested in these matches," Pepper said, speaking on behalf of Pastor Cal and Viviana. "And so when they start out so well, we are thrilled! We are really happy!"

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Pepper later got emotional again when watching back a Season 12 clip of Vincent and Briana dancing for the first time as husband and wife. Vincent said in the clip he felt like he had already known Briana for years.

"It gets to me! It's so sweet!" Pepper said all teary-eyed. "Each of these couples is connecting, and just seeing that connection is just heart-filling."

When asked to reveal her favorite part of the weddings, Pepper shared it's the self-written vows.

"What I really want to see is what the vows are. I want to see how well somebody expresses what they hope for and who they are. And whenever it's heartfelt, I tear up! It's just so great. So I really like that," Pepper shared.

On Married at First Sight's currently-airing twelfth season, Clara made it clear she was attracted to Ryan immediately and they seemed "meant to be."

Vincent and Briana also had instant chemistry when they met at the altar, and Vincent said he was convinced their personalities complemented one another once he got to talk to Briana and get to know her better.

On the show's latest episode that aired last week, Clara said laying in bed with her husband after their wedding felt good and she figured sparks and chemistry would come easy and naturally for the both of them.

"If sex happens, it happens. But maybe we'll keep that to ourselves -- we'll see!" Clara told the cameras with a laugh.

As Clara previously revealed on an episode of Unfiltered, she'd be willing to try anything once in the bedroom to make her husband happy!

And Briana and Vincent had nothing but optimism and excitement in their hearts on their wedding night.

Briana discovered that Vincent is caring, supportive and "everything [she had] envisioned," and Vincent seemed pretty smitten with his new wife.

"She's definitely my type, like, petite, beautiful, really nice face and really nice features. I definitely feel super attracted to her, and I'm hopeful," Vincent noted.

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About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.