Love is in the air when the unsuspecting 16 new houseguests check in for the ninth season of "Big Brother," appropriately titled "Big Brother: 'Til Death You Do Part." The competitors had no idea that they were being paired up until they arrived to play the game.

"For the first time, they will be playing as a pair," explains series host JULIE CHEN, who takes ET on a tour of the new facilities. "We have coupled them up because we believe they could be potential soul mates from a questionnaire they filled out -- someone who could be the love of their life."

The eight couples will be required to sleep together, compete together and, possibly, get evicted together.

This season, the chalet-style, A-Frame has been designed to resemble a lake house. Since this is the first time that "Big Brother" has ever aired in winter, the swimming pool and whole sections of the yard are heated. In addition, there is a cozy outdoor fire pit, which is perfect for backyard gatherings. And the exercise equipment has been moved outdoors to allow for an indoor spa to be built.

In keeping with the lake house theme, the main bathroom floor has been covered in a blanket of autumn leaves. The custom made tiles were actually printed using real photos of fallen leaves, and the murals on the walls of the shower add to the outdoorsy feel.

The only private bathroom is in the head of household suite, but it, like the rest of the house, is under scrutiny of "Big Brother" cameras.

"Big Brother: 'Til Death Do You Part" premieres tonight at 9 p.m. on CBS.