The couple - who welcomed their first child Camden into the world in August 2012 - reportedly purchased a marriage licence at the Davidson County Clerk in Nashville on Friday, which will be valid for 30 days, according to TMZ.
Kristin, 26, recently enjoyed a bridal shower at the London Hotel in West Hollywood.
The bride to be was joined by a small group of her best girlfriends for the High Tea themed party which was sponsored by CIROC vodka.
No former cast mates at the wedding:
While Kristin found fame on MTV reality TV shows Laguna Beach, The Real OC and The Hills, the blonde beauty revealed she isn't inviting any of her former cast mates to her wedding.
She said: "It's going to be family and really close friends. If the wedding were bigger, I would have loved to invite Audrina Patridge, Stephanie Pratt and Heidi Montag.
"It's going to be perfect. We're ready to be together for the rest of our lives."
Kristin added she is now fully prepared and ready for her big day. "Everything is planned and ready to go, but that's all I'm going to tell you."
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