Renewing your wedding vows - should you do it?

Justin Timberlake and Jessica Biel have done it; Sharon and Ozzy Osborne have done it; Ellen DeGeneres and Portia De Rossi have done it; even Beyonce and Jay-Z have done it! Let’s face it, these celebrity A-Listers know how to plan spectacular weddings but now it seems once just isn’t enough.

So, why do couples renew their wedding vows?