The Washington teacher who twice became pregnant by her sixth-grade student and did hard time for it, says she's marrying him for love.

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Mary Kay Letourneau, 43, and fiance, Vili Fualaau, 22, discuss their relationship and upcoming nuptials on "Entertainment Tonight" Thursday.

The previously married Letourneau was sentenced to more than seven years in prison for having sex 10 years ago with her fiance.

"There are tragic things that happen in everyone's life and this certainly was a tragedy," Letourneau told "ET.""Those hard times pass and we had to both maintain a lot of strength ... we're here and we're hopeful."

After news of Letourneau's affair with her student broke in 1996, her husband divorced her and took their four children to Alaska to live.