On Friday, TMZ reported that Cavallari and the Chicago Bears quarterback, 30, traveled to Davidson County Clerk's office in Nashville, Tenn. and bought their marriage license.
The couple, who welcomed their first child together, son Camden, last August, have been planning a wedding for this summer. Cavallari and Cutler became engaged in April 2011, but briefly called it off in July 2011 before reconciling.
"It's going to be about 150 people, so not huge," the Laguna Beach star told Us Weekly in May. "I was never the girl who dreamt about my wedding or any of that stuff, but the wedding how we're planning is exactly what I wanted. I think it's going to be perfect for what we're doing."
Cavallari celebrated her bridal shower with friends at The London Hotel in West Hollywood on June 2. For her high tea-themed party (sponsored by Ciroc), the bride-to-be wore a bridal sash and faux-diamond tiara. She also received fuzzy handcuffs and other fun toys for her honeymoon.