Gene Simmons and Shannon Tweed's Wedding Countdown

The wedding between KISS rocker Gene Simmons and longtime girlfriend Shannon Tweed is only one day away, and ET is talking to the couple about the lead up to their momentous day.

Speaking about his proposal to Shannon, Gene tells ET, "I will tell you that when I was standing in front of Shannon, my knees started to buckle," Simmons said. "I went down and I thought 'Uh oh, I guess I'm doing it.'"

Check out the video for more from Gene and Shannon before their wedding which takes place this Saturday, October 1.

To see more of the wedding preps and the ceremony tune into the premiere of Gene Simmons Family Jewels airing on A&E on October 4, 2011 at 9PM.