Haley, who donned a form-fitted lace dress by Galia Lahav with see-through components and floral appliques, posted a sweet video of wedding highlights on Sunday and captioned it, "A million perfect moments all led up to this."
The Bachelor alum told Oula through tears in her wedding vows, "Since the day I met you, I knew you were a special man. I even came home and told my sister, 'This is the kind of man you marry.'"
And Oula told his blushing bride in reply, "The wise Matthew McConaughey once said. 'The woman of your dreams doesn't exist, so you might as well find the best one on this earth.' And in this case, it's kind of true, because you are exceeding every dream I could ever possibly have."
Haley and Oula said "I do" just over one year after Oula popped the question in May 2021. At the time Oula proposed, they had been dating for nearly two years.
Haley's twin sister and fellow The Bachelor alum Emily Ferguson naturally served as Haley's maid of honor in the wedding party of six bridesmaids, who all wore mid-length white dresses.
"This is the moment we've dreamt about since we were little girls! Having her by my side is such an honor," Haley gushed toUs Weekly of Emily before her big day.
"She has helped me so much that I'm almost sure nothing would have been accomplished without her. I'm very picky to the point where I can't decide on things and she has kind of been able to bring me down to earth and help me make really tough decisions when it comes to planning."
Emily posted a slideshow of wedding photos on her own Instagram account this past weekend and wrote, "June 11th,2022. The day my sister became a wife and the day I gained a brother in law. #thebestdayever"
And Haley gushed of her Bride Tribe on social media, "Couldn't have done it without these beautiful girls by my side!"
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"They hyped me up all night and made sure my dress was perfect, my feet were ok and that I was extra hydrated and well fed," she added. "Love you girls so much! Thank you @mananamariee for all the BTS!! I have so much wedding stuff to share with you all!"
For her part, Emily got engaged to hockey player William Karlsson in December 2020, shortly after the couple's four-year dating anniversary.
Following the romantic ceremony in front of 75 guests, Haley and Oula took the dance floor with a choreographed routine, and then Haley and her father performed a mashup dance together so they could show off their playful personalities, according to Us.
An Elvis Presley impersonator also put on a little show later in the evening "because it's Vegas and you have to," said Haley, before late-night McDonald's food was served.
"It means a lot to me to have them there for this special day. I have always remained close to Lauren and Amanda post-show. They were my closest friends while filming and I have loved watching both their love stories unfold," Haley shared.
The twins paid tribute to their own The Bachelor and Bachelor in Paradise days, when they both competed for Ben Higgins' heart on the show's 20th season and multiple Paradise seasons, by posting a video montage on Instagram.
"From The Bachelor in 2016 to both being engaged, going through these amazing adventures at the same time is truly what dreams are made of!" the girls wrote.
"Who's been following us since 2016!? #thebachelor #thebachelorette #bachelorinparadise #twins #twinning #thefergietwins #engaged #engagementring #wedding #bridal #bridetobe #2022bride."
Haley said she plans to take Oula's last name now that they're married.
"He's been my support system during all the planning! He's so excited to call me his wife and wear a wedding band!" Haley noted, adding how she was trying to "soak it all up."
And as for what's next, Haley revealed she and Oula will be enjoying their honeymoon in California.
"Since Oula is from Finland, he's actually never been to California," Haley told the magazine. "So we are going to [Laguna Beach] and Los Angeles -- going to the beach and Universal Studios since he loves Harry Potter."
But Haley said she and her new husband are in "no rush" to have children and they "just want to enjoy being married" for a while.
However, Haley and Oula would like to have two or three kids when they're ready.
"We won't be actively trying right after but if it happens, it happens. We will be happy either way," Haley said.
"I think Haley and Oula make a great match because they balance each other out!" Emily said of her sister and Oula in early 2020.
"Oula is very thoughtful and sweet. He always puts Haley first and I know he takes extra good care of her when I can't be there. I'm so happy for them and glad my matchmaking worked out!"
After neither bubbly social-media influencer and model was able to win Ben's heart on The Bachelor, they subsequently appeared on Bachelor in Paradise's third and fourth seasons.
Following Ben's stint on The Bachelor, he and his former fiancee, Lauren Bushnell, starred on a season of Ben & Lauren: Happily Ever After? on Freeform.
Since Emily and Haley often appeared on the series as Lauren's best friends, the twins took over for Ben and Lauren and starred on the subsequent season of the spin off, which was renamed The Twins: Happily Ever After?.
Freeform only aired one season of The Twins: Happily Ever After? in 2017.
While Emily got romantically involved with William in 2017, Haley returned to Mexico for another shot at love on Bachelor in Paradise's sixth edition in 2019.
Haley left Paradise single but went Instagram official with Oula in January 2020.