Mary Kay On Her Upcoming Wedding

She, Beau Talk About The Celebration, Their Vows, Moms' Views

(CBS)  If you thought former teacher Mary Kay Letourneau would have a nice, quiet, low-key wedding, think again.

Letourneau spent more than seven years in jail after having an affair with her then-12-year-old student, Vili Fualaau.

Fualaau is 22 now, Letourneau is 43, and after having two daughters together, they're walking down the aisle. "The Insider" licensed the exclusive rights to their story. "The Insider" anchor Lara Spencer spent some time with the couple.

On The Early Show Tuesday, Spencer told co-anchor Harry Smith the wedding will be a big one, with six bridesmaids, six groomsmen, and some 200 guests, thanks in part to the many people in Fualaau's family.

"She's treating this like it's the biggest day of her life," Spencer says, "and it is, to her."

Any bride would be nervous, Spencer suggests, but especially one in the national spotlight, as Letourneau has been.

"Are you nervous?" Spencer asked Letourneau. "Do you have jitters?"

"There's a few things that we still, a few detail areas that we have to lock down," Letourneau answered. "And then I think, uh, it's just gonna roll at a very fast pace. That gives me a little bit of it. They're not jitters. It's a, 'Whoa, this is gonna be fast!' You know, the days just keep going. Time doesn't stop."

Letourneau's dress just arrived in Seattle from Cristiana Couture. The sight brought tears to her eyes.

Looking at the dress, an emotional Letourneau asked, "Am I really this little?"

Spencer tells Smith that Letourneau is "definitely not a runaway bride, this one. She'll be there. She's in it for the long haul."