According to iamnotacelebrityasskisser, 

"The wedding will be one of the biggest, most memorable extravaganzas in recent history.

They have tentatively set a late 2013 wedding date. But they are still working out the details and the exact day. 

Wissam is going to splash big when he marries Janet. It's going to be the wedding of the century, according to the insider."

The couple will reportedly spend $3 million to fly in their 500 wedding guests from all over the world, while Wissam wants to give all attendees a $10,000 Rolex watch as a thank you gift.

However, the songstress started dating the billionaire who's almost a decade younger than her in 2010 right after she and music producer Jermaine Dupri called their 7 year relationship quits. 

Janet also had this to say about dating younger men:

"My mother always raised us to believe that age was just a number. All of us, my sisters, my brothers, we'll just tell you our ages because it's all about where you are mentally and how you feel about yourself. It doesn't matter."

What about kids?.... Oh well, best of luck to you both.