The couple came to fame in the late 2000s on The Hills, and appeared on I'm a Celebrity...Get Me Out of Here in 2010 and Celebrity Big Brother in 2013. The pair return to the small screen June 24 on Celebrity Wife Swap, and Montag gushed about the gig to Fox News ahead of their episode.
"I'm a huge fan of the show," she tells FOX411. "So, when we had the opportunity to do it, I just jumped right on it!"
The program sees celebrities trade spouses for a two-week period in an attempt to learn more about themselves and their families. Montag swapped her easygoing beach lifestyle for four-time Olympian Amanda Beard's rural household in Washington state.
"I've had the most positive response from this out of anything I've ever done," she shares. "People are really excited about this, which I'm really glad about because it's my favorite thing that we've ever done within our careers."
"My mom saw the preview and she told me, 'I can tell this is the first opportunity that you've ever had to be you,'" she continues. "It' was really fun to just be more authentic and be in a situation and see what happens. I'm shocked at how amazing it was. I'm really thrilled with everything, from beginning to end."
The reality star goes on to say that she and Pratt are "on a really good path, overall, in life" and are "just the happiest with every area of our lives." The Spencer/Pratt episode airs Tuesday at 10 p.m. ET on ABC.