"Sister Wives" star Aspyn Brown is a married woman.

People reported Aspyn, the 23-year-old daughter of Kody Brown and Christine Brown, tied the knot with Mitch Thompson at an outdoor wedding Sunday in Sandy, Utah.

Aspyn and Thompson said their vows in a mountaintop ceremony in front of 120 guests. Thompson, a carpenter, built the arch the couple were married under, according to TLC.

Aspyn wore a satin dress with beaded embellishment, while Thompson honored his Scottish heritage by wearing a kilt. The pair were feted at a 400-person reception after the ceremony.

Christine confirmed Aspyn's marriage on Twitter, writing, "Aspyn and Mitch and married!" Aspyn's sister Mykelti Padron posted a photo on Instagram with her husband, Tony Padron.

"Super fun incredible day to celebrate my sisters wedding," she captioned the picture.

Aspyn is the eldest child of Kody and Christine, who have five other children.

Kody, who practices polygamy, has another 12 kids with his three other wives, Meri Brown, Janelle Brown and Robyn Brown.