Arnold wed her fiance Sam Cusick in her hometown of Salt Lake City, UT, on Thursday, Us Weeklyreported.
"I've loved Sam since I was 16-years-old and today I officially get to spend the rest of my life with him -- through giggles and tears, and every moment in between!" Arnold, 21, told Us in a statement on her big day.
Arnold reportedly donned a vintage lace sleeveless dress from Castle Couture. Her bridal party included Dancing with the Stars pros Witney Carson and Emma Slater as well as her fellow DWTS Troupe members Brittany Cherry and Brooklyn Fullmer.
The bride and groom adorably snacked on In-N-Out burger prior to their wedding.
The reception, with music by DJ Rob Ferre, featured a formal sit-down dinner for 400 guests, according to the magazine, and they ate pepper steak flambe and chicken with a honey-pecan butter sauce. Desserts ranged from cheesecake bites and chocolate covered strawberries to lemon bars and flourless chocolate cake with raspberry couilis.
On the day of the couple's ceremony, Carson -- who has expressed how she's best friends with Arnold multiple times -- congratulated them with a sweet message on Instagram.
"Can't believe today's the day! My heart is so full of love and happiness for my best friend @lindsarnold and her now HUSBAND @samcusick," Carson captioned a photo of Arnold and Cusick kissing in the street. "Let the celebration begin! #CusickWedding #alreadycrying."
Arnold celebrated her bachelorette party at CLEO in West Hollywood earlier this month.
The dancer announced her engagement in December 2014 after Cusick popped the question while they were vacationing in Africa.
Arnold competed on the ninth season of So You Think You Can Dance in 2012 and made the Top 8 contestants. She then joined ABC's Dancing with the Stars, serving as a pro in Season 16 with celebrity partner Victor Ortiz and then dancing in the show's Troupe ever since.