“I’m a huge fan of the show,” Heidi told FOX411. “So, when we had the opportunity to do it, I just jumped right on it!”
Montag's first reality TV show 'The Hills' was criticized for being a scripted show that didn't show anything audiences felt was truly 'real.' This time around Montag says this show is going to be more "authentic" -- allowing her to be herself for the first time on TV.
"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.’ It’s just great to have that moment. It was really fun to just be more authentic and be in a situation and see what happens."
And Heidi is looking forward to live tweeting her appearance Tuesday night on “Celebrity Wife Swap.”
“I’ve had the most positive response from this out of anything I’ve ever done–on Twitter and Instagram–everything,” Heidi said. “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.’ It’s just great to have that moment. 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.”
“I mean, I had no idea where I was going,” explained Heidi of her initial reaction driving through the rugged woods southwest of Seattle. “I thought that it was that guy who lived in a tree and builds the tree houses! The last person I ever thought I was ever going to swap with was Amanda Beard, that’s for sure.”
In the episode, the duo will be swapping with seven-time Olympic gold medalist and swimmer Amanda Beard and her husband Sacha Brown. Heidi immediately fell in love with the Beards’ two young children, Blaise Ray, 4 1/2, and Doone Isla, 9 months.
“I think when Doone fell asleep on me the first night, I mean, it just really solidified my longing for motherhood–it was everything I thought it would be. It was really fun to be able to have the kids there and have that experience of having little ones. It’s something that I very much look forward to in my future.”
Heidi wants to have “two or three” children, but Spencer is not exactly on the same page as Heidi when it comes to having kids.
“This is probably the most divided in our opinions we’ve ever been,” Heidi explains. “I feel like it’s time. I’m ready and it’s exciting, but for (Spencer), I think it’s kind of scary and unknown.”
TMZ reports that Montag and Pratt are getting $50,000 dollars for appearing on the episode, about $20,000 more than some celebrity couples have received.
The 'Celebrity Wife Swap' episode will air on Tuesday, June 24th at 8 pm PDT.